20-gallon quiet compressor
Both are oil-free, quiet-series 20-gallon compressors, so they are tolerable in an attached garage. Pick on the sale, the warranty path and the noise rating you can live with.
Machine class fit sheet
Will a 20 gallon compressor fit your garage?
A 20 gallon compressor (our planning allowance) measures 28 x 20 in (2.3 x 1.7 ft), runs on 120V at 15 A. It fits with operator room in 6 of our 6 garage sizes, the smallest being the 12x20 one-car, and it fits with a sedan parked inside from the 12x22 one-car up.
28 x 20 infootprint
n/aweight not stated
120V15 A
2 HPmotor
This sheet describes a class of machine. The footprint is our planning allowance, not a single product's measurement: check the dimensions in the listing of the machine you choose.
Fit in each garage size
| Garage | Alone, operator room | Car parked, working | Car parked, stored | Share of floor |
|---|---|---|---|---|
| One-car, 12 x 20 | yes | no | no | 2% |
| One-car, 12 x 22 | yes | yes | yes | 1% |
| Two-car, 20 x 20 | yes | yes | yes | 1% |
| Two-car, 22 x 22 | yes | yes | yes | 1% |
| Two-car, 24 x 24 | yes | yes | yes | 1% |
| Three-car, 32 x 24 | yes | yes | yes | 1% |
"Operator room" keeps 12 in clear around the machine, and "stored" drops that zone, for a machine you roll out only when the car is gone. Both leave a 24 in apron in front of the overhead door and a 30 in walk-around beside any parked sedan. In a 12 x 20 ft garage with a car inside, this machine has to be stored elsewhere.
Electrical and moving it
- Circuit: 15 A at 120V on the planning allowance: a 20 A breaker and 12 AWG copper covers the 125 percent rule. On NEC Table 430.248 amps the same 2 HP motor comes to 30 A and 10 AWG on a 30 ft run. Have a licensed electrician confirm.
- Moving it: weight is not stated in our sources: read the listing, then size the base with the mobile base calculator.
Buy: Amazon and Grizzly
Same job, two ways to buy, with one line on when each wins.
Prices change often and Grizzly runs sales, so the buttons show current prices.
Moving and protecting it
Prices change often; the button shows today's price on Amazon.
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Other machine fit sheets
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Frequently asked questions
Does the 20 gallon compressor fit in a one-car garage?
Yes, in a 12 x 20 ft one-car garage with no vehicle it fits with its operator zone clear and uses 2 percent of the floor. With a sedan parked inside it does not fit at all.
What circuit does the 20 gallon compressor need?
It draws 15 A at 120V (planning allowance), so a 20 A breaker with 12 AWG copper covers the 125 percent rule. On NEC table amps for 2 HP the circuit comes out to a 30 A breaker and 10 AWG copper over a 30 ft run. A licensed electrician confirms the circuit before you wire.
This page is researched guidance, not professional electrical, engineering or safety advice. Circuits, loads and clearances depend on your house, your service and your town: have a licensed electrician confirm any wiring, and check local code and each manufacturer's manual before you act.
