What utilities does a dental chair need?

Key facts: three manufacturers compared

The ranges overlap but don't match. A compressor set for one brand may not suit another. That's why the chair has to be chosen before the plumber roughs in.

Who provides what?

The manufacturer specifies, and the contractor installs. A-dec's guide says the contractor supplies the right-angle shutoff valves, conduit, electrical box and receptacle, and the drain trap. It warns that local rules may require licensed plumbers and electricians, and that utilities "must be accessible without the use of tools" (A-dec). The design team, meaning the dealer, architect and contractors, is responsible for how utilities in the wall are accessed.

Air

A-dec calls for 1/2-inch compression fittings protruding 1–2 inches, with a shutoff valve whose handle sits no higher than 3-3/4 inches above the finished floor. Air pressure is 80–125 psi at 2.5 scfm in normal use, with 7.5 scfm peak, and lines must be flushed before connection (A-dec).

Planmeca specifies 80–130 psi (Planmeca). Dentsply Sirona's Axano requires 6.0–7.5 bar (87–109 psi) at a minimum of 70 Nl/min (Dentsply Sirona).

Compressor sizing is a whole-office question: how many chairs run at once. Patterson's design checklist notes compressors and vacuums come in different sizes for different numbers of users (Patterson).

Water

A-dec: 60 ± 20 psi, at least 1.5 gpm, not above 104°F (A-dec). A-dec notes its delivery system includes a self-contained water bottle. Municipal water is required only with a cuspidor or special facility requirements.

Dentsply Sirona specifies cold water of drinking-water quality at 2.5–6 bar (Dentsply Sirona).

Pressure is only half of it. CDC says dental unit output water should meet drinking-water standards (≤500 CFU/mL), and that bottle systems alone aren't enough. Plan for a waterline treatment product and follow the manufacturer's monitoring recommendations (CDC).

Vacuum

A-dec terminates central vacuum in a 1-inch PVC pipe protruding 2 inches. Its requirements are (A-dec):

• Wet systems: 10 ± 2 inHg at 9 scfm minimum
• Dry or semi-dry systems: 4.5 ± 1 inHg at 12 scfm minimum

The guide also says the vacuum supplier specifies the plumbing up to the floor box.

Dentsply Sirona specifies 0.12–0.18 bar at the treatment center connection with no flow, and DN40 polypropylene suction lines (Dentsply Sirona).

High-volume evacuation matters for compliance too. Washington's dental rules require HVE equipment to be installed and maintained to the manufacturer's specifications (WAC 246-817-655).

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 your equipment dealer and the manufacturer's specs.

Drain

Only chairs with a cuspidor need one. A-dec specifies a 1-1/2-inch nominal pipe protruding 1 inch, a contractor-supplied trap, a minimum slope of 1/4 inch per foot, and capacity for 4.5 gpm without overflow, floor mount only (A-dec).

Power

A-dec calls for 1/2-inch conduit and a vertically oriented box with a hospital-grade quad receptacle, top no higher than 5 inches above the floor. The circuit is 120 V/15 A minimum or 240 V/10 A (A-dec). Dentsply Sirona's Axano specifies a 20 A breaker at 100–115 V and recommends a Type B automatic breaker (Dentsply Sirona).

Data

This is the utility most often forgotten at the chair.

• A-dec 511: 2-inch data conduit. A-dec+ connectivity works over 10/100 Ethernet or Wi-Fi, but A-dec recommends Ethernet with Cat5e or higher (A-dec).
• A-dec 200: 2-inch conduit "as many as required," with Cat5e or Cat6 where Ethernet is needed (A-dec 200).
• Dentsply Sirona Axano: an IT installation pipe of at least 50 mm. The treatment center and the practice PC need separate Ethernet connections, and the chair may not reach the internet through the PC (Dentsply Sirona).

That last point affects your drop count. A connected chair is its own network device. Count it in your network drops per operatory.

Floor and structure

A-dec's 511 needs a level surface supporting 1,192 lb (chair, light, delivery system and patient) and anchors rated for 350 lb pullout each (A-dec). Planmeca's Compact i Classic must be fixed to the floor (Planmeca).

When do these need to be on the drawings?

Before rough-in, and ideally before permit. One Virginia contractor notes that plumbing rough-ins under the slab must match the equipment model's connection locations (CVI). See 12 causes of build-out delays and the operatory equipment checklist.

To see this on your own floor plan, FloorStack Studio (live, free plan) builds a 3D IT plan of your office with every device placed.

To test this on your own suite before paying for drawings, the free dream-practice builder (coming soon) is planned for sketching rooms, operatory counts and layouts.

How FloorStack helps

FloorStack checks compatibility before you add equipment to a plan. The free Studio plan, part of the FloorStack dental build-out platform, works out cabling, ports and the rack around the devices you pick, and produces a low-voltage drop map for your contractor (FloorStack). Plumbing, air and vacuum still come from the manufacturer's guide and your MEP engineer. Start a free Studio plan, or see the Dental Equipment Planning hub.

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).

Free tools for this step

• FloorStack Studio (live, free plan): a 3D IT plan of your office with every device placed.
• 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.