Generalaire G-99 Air Filter Gage User Manual download pdf

Installation Manual

General Filters, Inc. 43800 Grand River Ave., Novi, Michigan 48375 •

Toll Free (866) 476-5101

Phone: (248) 476-5100 • Fax (248) 349-2366 • www.generalaire.com

ApplicAtion

precAutions

instAllAtion

The G-99 Air Filter Gage provides a visual indication of the need to replace the air ﬁlters in forced

air heating and cooling systems. The gage is installed between the blower and the ﬁlter where

a slight vacuum exists due to the air ﬂow resistance of the air ﬁlter. Air ﬂowing into the gage,

around the calibration screw, lifts a vane in proportion to the negative pressure in the blower

compartment. As the air ﬁlter loads, the vacuum increases, raising the vane to indicate a ﬁlter

change is necessary.

The gage may be calibrated in a negative pressure range from 0.1 to 0.4 inch w.c. When

properly calibrated in this range a vacuum increase of 0.10 to 0.15 inch w.c. will indicate a ﬁlter

change is necessary.

The installer should be an experienced service technician. When drilling the hole in the blower

compartment extreme care should be taken not to damage components within the heating or

cooling system.

The gage must be located where it can sense pressure conditions

in the blower compartment between the ﬁlter and the blower.

Select a location on a vertical surface enclosing the blower

compartment and drill a 3/8" hole. Remove the protective paper

from the foam adhesive strip on the back of the gage. Mount the

gage in a level position with the pressure sensing tube projecting

into the blower compartment.

The gage may be remote mounted with a maximum length

of 10 feet of 5/16 inch inside diameter vinyl tubing. Order

remote Kit part No. G99-14

Model G-99 Air Filter Gage

AIR

FILTER

BLOWER

RETURN

AIR

GAGE

1 2

Installation Manual 1

Summary of Contents

Page 1 - Installation Manual

Installation ManualGeneral Filters, Inc. 43800 Grand River Ave., Novi, Michigan 48375 • Toll Free (866) 476-5101Phone: (248) 476-5100 • Fax (248)

Page 2

General Filters, Inc. 43800 Grand River Ave., Novi, Michigan 48375 • Toll Free (866) 476-5101Phone: (248) 476-5100 • Fax (248) 349-2366 • www.g

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Generalaire G-99 Air Filter Gage User Manual

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