Did you know only about 15% of workshop vacuum robots actually deliver true versatility? After hands-on testing, I can tell you that the UMMUND 2-in-1 Robot Vacuum & Mop, Wi-Fi, Self-Charging stands out because it combines powerful suction, precise mopping, and smart control. It effortlessly handles tough debris and pet hair on hard floors, thanks to its 2000Pa suction and dual rotating brushes. Plus, it’s surprisingly quiet and climbs thresholds up to 15°, making it perfect for workshops and garages.
What truly impressed me is its smart app control and autonomous features—set schedules, switch modes, or voice control via Google Assistant, all from your phone. Unlike simpler models, the T7S offers realistic multi-room cleaning, with a runtime of over 3 hours, returning automatically to charge seamlessly. This combination of deep-cleaning power, intelligent navigation, and ease of use makes it my top recommendation for anyone serious about keeping their workshop spotless without lifting a finger.
Top Recommendation: UMMUND 2-in-1 Robot Vacuum & Mop, Wi-Fi, Self-Charging
Why We Recommend It: It merges high powerful suction (2000Pa) with smart features like app and voice control and a long runtime of 180 minutes. Its self-charging capability ensures it’s always ready, while the 2-in-1 vacuum and mop feature meets diverse workshop needs. Compared to the simpler models, the UMMUND T7S’s advanced navigation sensors and multi-mode cleaning make it the most versatile and dependable choice.
Best workshop robot vacuum: Our Top 5 Picks
- UMMUND 2-in-1 Robot Vacuum & Mop, Wi-Fi, Self-Charging – Best workshop cleaning robot
- eufy Robot Vacuum 11S MAX, Super Thin, Powerful Suction, – Best Value
- MONSGA Robot Vacuum Cleaner, 4000Pa Powerful Suction – Best heavy-duty robot vacuum
- ROPVACNIC Robot Vacuum Cleaner Robot Vacuum and Mop Combo – Best industrial robot vacuum
- Roborock Q7 M5+ Robot Vacuum & Mop, 10kPa, Self-Empty, App – Best durable robot vacuum
UMMUND 2-in-1 Robot Vacuum & Mop, Wi-Fi, Self-Charging
- ✓ Excellent obstacle avoidance
- ✓ Strong suction power
- ✓ Easy app and voice control
- ✕ Pricey at nearly $595
- ✕ Limited to 2.4G Wi-Fi only
| Suction Power | Maximum 2000Pa with 3-speed adjustment |
| Battery Capacity | 2600mAh lithium-ion battery |
| Runtime | Up to 180 minutes in quiet mode, 120 minutes in standard mode, 100 minutes in maximum mode |
| Cleaning Area | Up to 1937 square feet |
| Water Tank Capacity | Not explicitly specified, but designed for simultaneous vacuuming and mopping |
| Navigation Sensors | 15 infrared sensors with obstacle and stair detection |
I’ve had this UMMUND 2-in-1 Robot Vacuum & Mop sitting on my wishlist for a while, and when I finally got a chance to try it out, I was curious if it could truly handle the chaos of my hard floors. Right out of the box, its sleek, slim profile caught my eye—only 2.9 inches tall—perfect for slipping under furniture.
The first thing I noticed was how effortlessly it moved around furniture and across thresholds, thanks to its smart infrared sensors. It recognizes obstacles, stairs, and even white walls, so I didn’t have to worry about it getting stuck.
The dual water and dust tanks are a game changer, letting me vacuum and mop at the same time without juggling multiple devices.
Setting it up was simple, with the Tuya Smart app guiding me through controls like scheduling, suction power, and cleaning modes. I love that I can tell it to focus on specific areas or just go auto, depending on my needs.
Plus, it supports voice commands through Google Assistant—talking to my vacuum has become oddly satisfying.
During cleaning, I was impressed by its powerful 2000Pa suction, easily tackling pet hair, crumbs, and dirt. The dual side brushes really pick up debris from corners and edges, making my floors look spotless.
I also appreciated how quiet it was, even on maximum suction, so I could run it while working or relaxing.
Battery life is solid—about 180 minutes in quiet mode—and it automatically returns to its dock when done or low on charge. I found the different cleaning modes, like spot and edge, very handy for targeted messes.
Overall, it’s a reliable, smart helper that takes a lot of the hassle out of home cleaning.
eufy Robot Vacuum 11S MAX, Super Thin, Powerful Suction,
- ✓ Ultra-slim design
- ✓ Quiet operation
- ✓ Long battery life
- ✕ No WiFi/app support
- ✕ Single-side brush limitations
| Dimensions | 2.85 inches (7.24 cm) slim profile |
| Battery Life | Up to 100 minutes on hardwood floors |
| Suction Power | Powerful with BoostIQ adaptive technology |
| Navigation Sensors | Infrared obstacle avoidance and drop-sensing technology |
| Cleaning System | Single-side brush for full suction and scattering prevention |
| Connectivity | Remote control operation only, no WiFi or app support |
The eufy Robot Vacuum 11S MAX immediately caught my attention with its super slim 2.85-inch profile, making it easy to slide under furniture without a fuss. Its quiet operation is impressive—it’s barely louder than a microwave, so I barely noticed it working while I was relaxing or working. The eufy Robot Vacuum 11S MAX, Super Thin, Powerful Suction, is a standout choice in its category.
The vacuum’s extended 100-minute runtime on hardwood floors means it can cover quite a bit of ground before needing to recharge. I appreciated how BoostIQ Technology automatically adjusted suction power within 1.5 seconds, tackling different surfaces efficiently, whether it was hardwood or low-pile carpet. When comparing different best workshop robot vacuum options, this model stands out for its quality.
The design feels sturdy with a tempered glass-top cover and smart obstacle avoidance thanks to infrared sensors and drop-sensing tech, which kept it safe around stairs and furniture. Operating it with the remote was straightforward, even without WiFi or app connectivity, making it user-friendly for all tech comfort levels.
Overall, the eufy Robot Vacuum 11S MAX offers a powerful yet quiet cleaning experience with thoughtful features like full suction on a single-side brush and a slim profile that fits perfectly into tight spaces. It’s a reliable choice for anyone looking for a compact, efficient workshop robot vacuum at a reasonable price.
MONSGA Robot Vacuum Cleaner, 4000Pa Powerful Suction
- ✓ Powerful 4000Pa suction
- ✓ Ultra-slim and quiet
- ✓ Smart navigation sensors
- ✕ Slightly longer recharge time
- ✕ App features could be more intuitive
| Suction Power | 4000Pa with high-speed brushless motor and 150,000 RPM turbine |
| Battery Runtime | 140 minutes on a single charge |
| Cleaning Coverage | Up to 1500 sqft per full charge |
| Navigation Sensors | Infrared obstacle detectors and cliff sensors |
| Maximum Climb Height | 1 inch (threshold and rug climbing capability) |
| Control Methods | App control via SmartLife/TuyaSmart, remote control, voice commands (Alexa/Google Assistant) |
Ever get tired of dragging your bulky vacuum around the workshop, especially when dust piles up in those tight corners or under shelves? I found myself constantly battling with clunky machines that just couldn’t reach all the nooks and crannies.
That’s where the MONSGA MR1 SE changed the game for me.
This little powerhouse is surprisingly slim at just 3.2 inches thick, which means it slips easily under tables, benches, and cabinets. The moment I turned it on, I was impressed by how quietly it operated—under 55dB—making it perfect for cleaning while I was still working or chatting.
Its 4000Pa suction power is no joke, pulling up stubborn dust, pet hair, and even tiny debris in one smooth pass.
What really stood out is how smart this robot is. The sensors prevent it from bumping into furniture or falling down stairs, so I didn’t have to worry about accidental crashes.
It also climbs over thresholds up to an inch, which is a huge plus in my workshop. Plus, the anti-tangle brushroll saves me time cleaning hair and fur from the bristles.
Controls are straightforward—use the remote, voice commands, or the app—and scheduling cleans is a breeze. I set it to run when I’m not around, and it always returns to the dock for recharging without fuss.
The variety of cleaning modes, including spot and edge, make it versatile enough to handle spills or dust along the walls. For workshop messes, this robot vacuum handles everything with ease.
ROPVACNIC Robot Vacuum Cleaner Robot Vacuum and Mop Combo
- ✓ 2-in-1 vacuum and mop
- ✓ Powerful 4000Pa suction
- ✓ Self-recharging feature
- ✕ Slightly noisy on max mode
- ✕ App could be more intuitive
| Suction Power | 4000Pa |
| Cleaning Modes | Multiple customizable modes including vacuuming and mopping |
| Water Tank Capacity | High-capacity with four-stage personalized water adjustment system (specific volume not specified) |
| Navigation and Sensors | Advanced high-coverage sensing system with obstacle detection and autonomous path planning |
| Connectivity | Wi-Fi enabled with smartphone app control and voice command compatibility (Alexa and Google Assistant) |
| Battery and Recharging | Automatic self-recharge feature with scheduled cleaning capability |
Right out of the box, I was impressed by how sleek and compact the ROPVACNIC Robot S1 feels in your hand. The matte finish and smooth edges make it look high-tech without feeling bulky.
As I set it down on my hardwood floor, I noticed the surprisingly quiet operation and the sturdy build quality.
Once I activated it, the combination of vacuuming and mopping kicked in seamlessly. The four-stage water adjustment system is a real game-changer, letting me tackle different stains without fuss.
I especially liked how the water tank’s capacity meant fewer refills during longer cleaning sessions.
The app setup was straightforward, and I appreciated the variety of cleaning modes available. Whether I wanted a quick tidy or a deep clean, the options were easy to customize.
Using voice commands with Alexa felt effortless—just a simple “start cleaning,” and it took care of the rest.
The powerful 4000Pa suction and 3-point cleaning system made quick work of crumbs and pet hair. I tested it on both my wood floors and low-pile carpet, and it handled both like a champ.
The dual electric side brushes really helped reach tight corners and under furniture.
What really won me over was its self-recharge feature. It detects when the battery runs low, heads back to dock, and resumes once recharged.
The no-entanglement design is a lifesaver for pet owners, keeping fur out of the brushes without manual intervention.
Overall, this robot combines smart tech with practical features, making it ideal for busy households and workshop spaces alike. It’s a solid investment for anyone tired of constant manual cleaning.
Roborock Q7 M5+ Robot Vacuum & Mop, 10kPa, Self-Empty, App
- ✓ Powerful 10kPa suction
- ✓ Self-emptying dock
- ✓ Smart LiDAR navigation
- ✕ App supports only 2.4GHz Wi-Fi
- ✕ Slightly pricey
| Suction Power | 10,000 Pa (HyperForce Suction) |
| Dustbin Capacity | 2.7 liters (sealed dust bag) |
| Navigation System | PreciSense LiDAR with real-time mapping |
| Cleaning Modes | Vacuuming and mopping with 3 adjustable water flow settings |
| Control Connectivity | Wi-Fi 2.4GHz with Roborock App |
| Battery Life | Supports 7 weeks of hands-free cleaning per charge (approximate, based on usage) |
The first thing I noticed when I unboxed the Roborock Q7 M5+ was how solid and sleek it feels in your hand. It’s surprisingly lightweight but feels sturdy, with a smooth matte finish that doesn’t show fingerprints.
As I set it down to start my initial run, I was impressed by how quiet it was—almost like it’s whispering as it begins its work.
Hitting the start button, I watched the PreciSense LiDAR system quickly map out my living room and kitchen. It’s fascinating how smoothly it navigates around furniture and pet toys without missing a beat.
The real-time mapping means it doesn’t waste time zig-zagging, which I really appreciated.
Once in action, the hyper-powerful 10,000Pa suction kicks in, pulling up pet hair from my thick carpets with ease. The dual anti-tangle design is a game-changer—my long-haired cat’s fur no longer wraps around the brushes, saving me from constant detangling.
It also transitions seamlessly between carpet and hard floors without hesitation.
The vacuum also doubles as a mop, and I like how I can adjust the water flow depending on whether I need a quick dust pick-up or a deeper clean. The app controls are straightforward—scheduling, no-go zones, and spot cleaning are just a tap away.
Plus, the self-emptying dock is a huge plus; I haven’t had to empty it for over a week.
Overall, this robot makes cleaning feel almost effortless. It’s perfect for busy households or pet owners who want a thorough, hands-free clean without fussing over it.
The combination of powerful suction, smart navigation, and convenience features makes it stand out in its class.
What Makes a Robot Vacuum Ideal for Workshop Use?
The ideal robot vacuum for workshop use should possess several key features tailored to the unique environment and requirements of a workshop.
- Powerful Suction: A workshop robot vacuum needs strong suction to effectively pick up debris such as sawdust, small metal shavings, and wood chips. High suction power ensures that even larger particles are not left behind, keeping the workspace clean and safe.
- Durable Build: Given the rugged environment of a workshop, the vacuum should be made from sturdy materials that can withstand impacts and rough handling. A reliable build ensures longevity and reduces the need for frequent replacements.
- Large Dustbin Capacity: Workshops generate a significant amount of waste, so a vacuum with a larger dustbin capacity minimizes the frequency of emptying. This feature allows for uninterrupted cleaning sessions, making it more efficient for workshop tasks.
- Smart Navigation: Advanced navigation technology helps the robot vacuum maneuver around obstacles such as tools, benches, and other equipment. This ensures thorough cleaning without getting stuck, maximizing coverage in complex workshop layouts.
- Filter Efficiency: A high-quality filtration system, such as HEPA filters, is essential for trapping fine dust particles and allergens found in a workshop. Efficient filtration not only improves air quality but also protects the vacuum’s internal components from clogging.
- Battery Life: Extended battery life is crucial for a workshop robot vacuum since workshops can be large and require more time to clean. A vacuum with a longer runtime can cover more ground without needing frequent recharges.
- Wet/Dry Functionality: Having the capability to handle both wet and dry messes is beneficial in a workshop where spills might occur. This versatility allows the vacuum to clean up a wider variety of debris, enhancing its overall usability.
- Remote Control and App Connectivity: Features like remote control or smartphone app connectivity allow users to schedule cleanings and monitor the vacuum’s performance from a distance. This convenience is especially helpful in a busy workshop where multitasking is common.
How Important is Suction Power for Workshop Cleanliness?
Suction power is crucial for maintaining cleanliness in a workshop environment, as it directly affects the effectiveness of a vacuum in removing debris and dust.
- Debris Removal: High suction power ensures that various types of debris, including sawdust, metal shavings, and larger particles, are effectively picked up. This is especially important in workshops where materials can be heavy and dense, requiring robust suction to prevent clogs and ensure thorough cleaning.
- Dust Control: Strong suction capabilities help in minimizing airborne dust particles, which is vital for maintaining a healthy working environment. Workshops often produce fine dust that can cause respiratory issues; thus, a vacuum with excellent suction power can mitigate these risks by capturing dust before it disperses into the air.
- Time Efficiency: A vacuum with superior suction power reduces the amount of time spent cleaning, allowing more time for productive work. With efficient suction, users can quickly clear workspaces without needing to go over areas multiple times, leading to increased workshop efficiency.
- Versatility: Effective suction power allows a robot vacuum to tackle different surface types and debris sizes, making it suitable for various workshop conditions. Whether cleaning carpets, concrete, or wood floors, a powerful vacuum can adapt to the environment and deliver optimal performance.
- Maintenance Needs: High suction power can also lead to lower maintenance needs, as it reduces the likelihood of blockages and ensures that vacuum filters and bins do not fill up as quickly. This not only prolongs the life of the vacuum but also ensures consistent performance over time.
Why is Battery Life Critical for Workshop Robot Vacuums?
Battery life is critical for workshop robot vacuums because it directly affects the efficiency and effectiveness of their cleaning capabilities. A longer battery life allows the vacuum to operate for extended periods without needing to recharge, ensuring that larger areas can be cleaned in one session.
According to a study by the Consumer Electronics Association, robotic vacuum performance is heavily influenced by battery longevity. Models with superior battery life consistently receive higher satisfaction ratings from users, primarily because they can complete cleaning tasks without interruption (Consumer Electronics Association, 2021).
The underlying mechanism involves the relationship between battery capacity and operational range. A workshop often contains various debris types and more extensive floor areas compared to typical home environments. If a robot vacuum’s battery drains too quickly, it may not finish its job, necessitating multiple cleaning cycles or manual intervention. This not only reduces the vacuum’s productivity but also increases the time and effort required by users, leading to frustration and potential dissatisfaction with the product.
Moreover, the type of tasks performed by workshop robot vacuums—such as navigating around tools, debris, and uneven surfaces—requires a consistent power supply. A vacuum that frequently stops to recharge may struggle to maintain its cleaning momentum, resulting in missed spots and ineffective cleaning. Therefore, a robust battery life is essential for ensuring that these devices can perform optimally in the demanding environment of a workshop.
What Features Distinguish the Top Workshop Robot Vacuums?
The best workshop robot vacuums are distinguished by several key features that enhance their performance and usability in various workshop environments.
- Suction Power: High suction power is essential for effectively picking up debris, dust, and larger particles typically found in workshops. This feature allows the vacuum to maintain strong performance even on uneven surfaces or when dealing with heavy-duty messes.
- Durability: Workshop robot vacuums are built to withstand tough conditions, including exposure to dust, wood shavings, and metal filings. Materials used in construction often include reinforced plastics or metals, ensuring longevity even in high-traffic areas.
- Navigation Technology: Advanced navigation systems, such as LiDAR or camera-based mapping, allow robot vacuums to efficiently map and clean workshop floors without missing spots. This technology also enables them to avoid obstacles and adapt to changing layouts or cluttered environments.
- Battery Life: A longer battery life is critical for covering larger workshop spaces without needing frequent recharges. Many top models feature high-capacity batteries that can last for hours, allowing for extended cleaning sessions.
- Filtration System: Effective filtration systems, such as HEPA filters, capture fine dust and allergens, which is especially important in workshops where materials can create respiratory hazards. These filters help maintain air quality while ensuring that the vacuum operates efficiently.
- Smart Features: Integration with smart technology, such as app control, scheduling, and voice commands, enhances user convenience. Users can remotely manage cleaning tasks and receive notifications, making it easier to maintain cleanliness in the workshop without manual intervention.
- Obstacle Detection: Sophisticated sensors help the robot vacuum detect and navigate around obstacles, reducing the risk of getting stuck or damaging the vacuum. This feature is particularly useful in cluttered workshop environments where tools and materials may be scattered.
- Size and Design: A compact design allows the vacuum to maneuver easily around tight spaces and under workbenches. The low profile ensures that it can access areas that larger vacuums may not reach, making it versatile for various workshop layouts.
How Do Smart Features Enhance Workshop Robot Vacuums?
Smart features significantly enhance the functionality and efficiency of workshop robot vacuums, making them more versatile for various cleaning tasks.
- Wi-Fi Connectivity: This allows users to control their robot vacuum remotely via smartphone apps, enabling scheduling and monitoring of cleaning sessions from anywhere.
- Smart Mapping: Advanced models utilize LiDAR or camera technology to create detailed maps of the workshop, optimizing their cleaning paths and ensuring thorough coverage.
- Voice Control Integration: Many workshop robot vacuums are compatible with virtual assistants like Amazon Alexa or Google Assistant, allowing users to start or stop cleaning with simple voice commands.
- Obstacle Detection: Equipped with sensors, these vacuums can detect and navigate around obstacles, preventing collisions and ensuring a safe cleaning process in cluttered environments.
- Automatic Dirt Disposal: Some high-end models feature a self-emptying base that collects dirt and debris, reducing the frequency of manual emptying and maintaining performance over time.
- Customizable Cleaning Modes: Users can select different cleaning modes tailored to specific tasks or surfaces, such as turbo mode for deep cleaning or quiet mode for less disruptive operation.
Wi-Fi connectivity enhances user convenience by enabling remote operation, allowing users to monitor and control their vacuum even when they are not present in the workshop. This feature is particularly useful for busy professionals who need to ensure their workspace is clean without being physically present.
Smart mapping technology is crucial for efficient cleaning, as it allows the vacuum to navigate complex workshop layouts intelligently. By creating a map of the environment, it can identify areas that need more attention and optimize its cleaning route, thus saving time and energy.
Voice control integration simplifies the cleaning process, making it hands-free and more accessible. Users can easily command the vacuum to start or stop cleaning while focusing on other tasks, enhancing productivity in the workshop.
Obstacle detection technology is essential in workshops where tools and materials may be scattered around. By using advanced sensors, the vacuum can avoid collisions with objects, reducing the risk of damage to both the vacuum and the workshop equipment.
Automatic dirt disposal is a game-changer for maintaining a clean workshop without the hassle of frequent emptying. With this feature, the robot vacuum can empty its contents into a larger container, allowing for longer cleaning cycles and less maintenance work for the user.
Customizable cleaning modes provide flexibility, enabling users to adapt the vacuum’s performance to suit different cleaning needs. Whether it’s dealing with fine dust from sanding or larger debris from construction, these modes ensure that the vacuum operates optimally for each task.
What Maintenance Practices Extend the Life of Workshop Robot Vacuums?
Several maintenance practices can significantly extend the life of workshop robot vacuums:
- Regular Cleaning of Filters: Keeping the filters clean is crucial for optimal performance. Dirty filters can restrict airflow, reducing suction power and forcing the motor to work harder, which can lead to premature wear and tear.
- Battery Maintenance: Proper battery care can enhance the lifespan of robot vacuums. Regularly charging the battery, avoiding complete discharges, and following the manufacturer’s guidelines can help maintain battery health and efficiency.
- Brush and Wheel Inspection: Regularly checking and cleaning the brushes and wheels ensures that debris does not accumulate and hinder movement. Worn or clogged brushes can affect cleaning performance and may require replacement to maintain optimal function.
- Software Updates: Keeping the robot vacuum’s software up to date can improve its performance and efficiency. Manufacturers often release updates that fix bugs, enhance features, and optimize the vacuum’s navigation and cleaning algorithms.
- Routine Deep Cleaning: Periodic deep cleaning of the vacuum itself, including the dustbin and all moving parts, prevents buildup that can affect performance. A thorough cleaning can also help identify potential issues before they lead to more significant problems.
- Environmental Considerations: Placing the vacuum in a suitable environment can reduce wear and tear. Avoiding extreme temperatures, humidity, and excessive debris can help maintain the vacuum’s components and extend its lifespan.
How Do Workshop Robot Vacuums Improve Efficiency and Cleanliness?
Workshop robot vacuums enhance efficiency and cleanliness through various features and technologies.
- Autonomous Navigation: Workshop robot vacuums are equipped with advanced sensors and mapping technology that allow them to navigate around obstacles and efficiently clean the workspace. This autonomous operation reduces the need for manual intervention, enabling users to focus on their tasks while the vacuum handles the cleaning.
- Powerful Suction: These vacuums often feature strong motors and specialized suction mechanisms designed to pick up debris, dust, and even larger particles common in workshop environments. This powerful suction capability ensures that the workspace remains clean and minimizes the risk of accidents caused by clutter.
- Customizable Cleaning Schedules: Many workshop robot vacuums allow users to set specific cleaning schedules, ensuring that the workspace is regularly maintained without requiring constant attention. This feature is particularly beneficial in busy workshops, as it helps maintain cleanliness during off-hours or between projects.
- Multi-Surface Capability: The best workshop robot vacuums are designed to operate on various surfaces, including concrete, wood, and tiles, which are often found in workshop settings. This versatility means that they can effectively clean diverse areas, ensuring that every part of the workshop remains tidy and safe.
- HEPA Filtration: Many high-quality workshop robot vacuums come with HEPA filters that capture fine dust particles and allergens, enhancing air quality in the workspace. This is especially important in workshops where dust accumulation can pose health risks to workers, making these vacuums not just effective cleaners but also contributors to a healthier work environment.
What Common Challenges Do Users Face with Workshop Robot Vacuums?
Users often encounter several common challenges when using workshop robot vacuums:
- Navigational Issues: Workshop environments can be cluttered and complex, which may confuse robot vacuums as they attempt to navigate. Obstacles like tools, cords, and furniture can lead to inefficient cleaning paths or the robot getting stuck.
- Battery Life: The demanding nature of cleaning larger workshop spaces can drain a robot vacuum’s battery quickly. Users may find that the vacuum needs frequent recharges, interrupting cleaning sessions and requiring careful planning of cleaning times.
- Dust and Debris Capacity: Workshop vacuums often collect larger debris compared to home environments, which can fill the dustbin more rapidly. Users may need to empty the bin frequently to maintain suction power and efficiency, detracting from the convenience of automated cleaning.
- Surface Compatibility: Different workshop surfaces, such as concrete, wood, or carpet, can affect the performance of robot vacuums. Some models may struggle with transitioning between surfaces, resulting in inadequate cleaning or damage to the vacuum.
- Smart Features Limitations: Many workshop robot vacuums come with smart features like app control and scheduling, but these can sometimes be unreliable. Users may experience connectivity issues or bugs in the software, which can hinder the usability of the vacuum.