Where should the compressor and vacuum go?

Key facts

Where in the floor plan should the mechanical room go?

Away from patients, in its own room. A-dec's vacuum guide says to position the mechanical room away from treatment and patient areas in a dedicated enclosed space, and to avoid open layouts or shared ceilings between noisy equipment and quiet areas (A-dec). DentalEZ recommends sound-reducing techniques if the room is next to occupied office space (DentalEZ).

Balance noise against distance: piping length adds to the load on the vacuum. Midmark's sizing calculator factors in piping length and configuration (Midmark). A team-zone location near the clinical core, behind storage or the staff lounge, is a common compromise. To try positions on your own suite, the free dream-practice builder (coming soon) is planned for sketching rooms and layouts.

What goes in the mechanical room?

Benco's startup guide lists the air compressor, vacuum, boost transformer, control panel, nitrous, water manifold and amalgam separator (Benco Dental). Some practices also put the network rack here, but heat and dust make that a poor fit; see dental office network design.

An orthodontic designer lists "mechanical rooms that are too small to support real growth" among the most common design mistakes (Practice Results / Ross Orthodontic). Leave floor space and power for a second vacuum or a larger compressor.

What clearances do the units need?

Use the guide for the exact models you buy; clearances differ by brand.

How do you keep the room cool?

Vacuums and compressors make heat. A-dec lists maximum heat output from 4,469 BTU/hr for its smallest dry vacuum to 10,361 BTU/hr for its largest, with cooling-fan airflow of 203 to 471 cfm. It recommends forced air and HVAC input in addition to an exhaust fan if room temperatures can drift outside the 40–104 °F range (A-dec). Give the mechanical engineer the heat load of every unit before HVAC design.

Where does the compressor get its air?

From clean air. A-dec's compressor guide calls for a dust-free, climate-controlled room, a fresh-air intake pipe where needed (2 inches for one or two compressors), and, under the NFPA requirements it lists, an indoor intake must not be in a space where chemicals are stored or used, where patients are treated, or where a Category 3 vacuum discharges (A-dec). Vacuum exhaust runs to the outdoors; A-dec specifies a 2-inch exhaust vent, upsizing for long runs and adding a fan past 70 feet (A-dec). For the code side, see NFPA 99 for dental offices.

How do you keep the noise out of the operatories?

A-dec's guide recommends (A-dec):

• partitions of STC 50 or higher, with double-stud walls, resilient channels or staggered framing;
• mineral wool in wall cavities (5–10 STC points);
• acoustic caulk and sealing around every opening;
• isolation mounts and resilient ceiling channels;
• solid-core doors with perimeter seals;
• duct silencers or lined ducts, plus acoustic panels inside the room.

How do you size the equipment?

Count users. Midmark counts each high-volume evacuator as one user and each saliva ejector or nitrous scavenger as half, and asks for planned future operatories (Midmark). To size the compressor and vacuum for your chair count, the free compressor & vacuum sizing calculator (coming soon) is planned for this step; confirm any result with the manufacturer. See what size compressor and vacuum you need.

Who owns each part of the mechanical room?

The mechanical room sits between several trades, which is why details fall through the gaps. Before construction starts, write down who is responsible for each item:

• Equipment dealer or installer: model selection, the manufacturer's installation requirements and startup of the compressor and vacuum.
• Mechanical engineer or HVAC contractor: ventilation or cooling for the heat the units give off, and the fresh-air intake path.
• Plumber: vacuum and air piping, drains and any water supply the vacuum needs.
• Electrician: dedicated circuits sized to the equipment the dealer actually ordered.

If the equipment model changes after the drawings are done, send the new specifications to every trade on that list.

Which free tools help with this?

FloorStack Studio (live, free plan) places every device on your floor plan and gives you a device schedule with rooms, ports and cable lengths (FloorStack FAQ).

How FloorStack helps

FloorStack is a dental build-out platform that keeps the mechanical room's location, clearances and equipment list on the same plan as the operatories it serves. Start at the Dental Equipment Planning hub, and see dental chair utility requirements and planning future operatories.

Related guides: wet vs. dry vacuum and running dental vacuum lines.

Free tools on the FloorStack dental build-out platform for this step: Dream-practice builder (free tool, coming soon) and Compressor & vacuum sizing calculator (free tool, coming soon). Also use FloorStack Studio (live, free plan).

Free tools for this step

• Dream-practice builder (free tool, coming soon): sketch rooms, operatory counts and layouts on your own suite before you pay for drawings.
• Compressor & vacuum sizing calculator (free tool, coming soon): size the compressor and vacuum to your chair count; confirm with your dealer.
• Studio (live, free plan): map every device and drop on your floor plan.