GeneralAire GF1137L Humidifier | Installation in Montreal, Laval, Longueuil, South Shore and North Shore
Is it the right size for your home?
It puts 18 gallons of water a day into the air (with 49 °C (120 °F) furnace air), enough to humidify up to 1,770 sq ft according to the manufacturer. Pick your home's living area.
It's the right size.
For a 900 to 1,500 sq ft house, it's within its range. It will run at part load on ordinary days and keep a reserve for the coldest days.
Area published by GeneralAire for an average-construction home. For a very tight home, GeneralAire gives 3,000 sq ft. Older or leaky house: go one size up; our estimator confirms it on site.
What it does, in numbers
Output: manufacturer's spec (18 gal/day, with 49 °C (120 °F) furnace air).
What you should know about this one
Published, verifiable figures, not brochure claims.
18 galWhat it produces per day, at full output
About 68 litres of water turned into humidity in 24 hours. The control runs it to match the humidity you set: it rarely runs flat out, except in very cold weather.
Heat pumpBehind a heat pump, it produces less
It evaporates water from a pad using the heat of the air coming off the furnace. A heat pump blows cooler air, so it evaporates less. With a heat pump, talk to our estimator: depending on the manufacturer, we connect it to hot water or suggest a steam model instead.
0 ductNo bypass duct
Its fan runs with the furnace blower through a 24 V isolation relay. It mounts on the warm-air plenum, with a 15 × 9¾ in. opening.
SummerA damper to close for summer
It has an air damper you close at the end of the heating season.
Heat pumpGeneralAire advises against it below 49 °C
The manufacturer doesn't recommend it with a heat pump, or when the plenum air is below 49 °C (120 °F). In that case, we suggest a steam model.
ControlThe control that comes with it
GeneralAire MHX3 manual humidistat.
UpkeepWhat gets replaced, and when
GF-990-13 Vapor Pad, the same as the GF1042, replace once or twice a season.
35%The humidity to aim for in winter, at most
At −7 °C, no more than 35%; at −18 °C, no more than 25%. Above that, the moisture condenses on the windows. The control adjusts for you if it has an outdoor sensor.
5 yearsThe manufacturer's warranty, and what it covers
5 years on the solenoid valve and relay, 1 year on the fan. We register the warranty in your name at start-up.
What it needs on site
Our estimator checks the ducts, the water supply and the drain before ordering.
Complete spec sheetData and cited sources
- Brand
- GeneralAire
- Model
- GF1137L
- Type
- Fan-powered
- Output
- 18 US gal/day (with 49 °C (120 °F) furnace air)
- Water to drain
- About 3.5 gal/h while running
- Control included
- GeneralAire MHX3 manual humidistat.
- Upkeep
- GF-990-13 Vapor Pad, the same as the GF1042, replace once or twice a season.
- Living area
- Up to 1,770 sq ft
- Dimensions (L × D × H)
- 16 × 11 × 14 in
- Power supply
- 120 V
- Weight
- 19 lb
- Warranty
- 5 years on the solenoid valve and relay, 1 year on the fan.
Output, dimensions, electrical data and warranty: GeneralAire manufacturer's data.
The next model down and up
Talk to an HVAC technician before you choose
We look at your heating system, the electrical panel, the water supply and the drain, and give you an installed price.
GeneralAire GF1137L: the fan-powered humidifier with no bypass duct
The GF1137L is a fan-powered humidifier. It pushes the warm air through its pad itself instead of relying on a bypass duct. It delivers 18 gal/day with 49 °C (120 °F) furnace air, for a home of up to 1,770 sq ft according to the manufacturer.
A fan instead of a bypass
Its fan runs at the same time as the furnace blower, through a 24 V isolation relay. There's no second opening to cut in the other plenum. An air damper closes at the end of the heating season. It uses the same GF-990-13 pad as the GF1042 and comes with the MHX3 manual humidistat.
What it requires
It mounts on the warm-air plenum, with a 15 × 9¾ in. opening. The fan runs on 120 V. It also needs a water supply and a drain. The pad is replaced once or twice a season. The warranty is 5 years on the solenoid valve and relay, and 1 year on the fan. GeneralAire doesn't recommend it with a heat pump, or below 49 °C (120 °F) in the plenum.
Before we install, we come and look
Our estimator visits before any quote: they examine the heating system, the panel capacity, the water supply and the drain. AirGreen installs in Montréal, Laval, Longueuil, the South Shore and the North Shore. Call 514 316-2973.