11
Heat & Glo • 350X-AU, 550X-AU Installation Manual • 2279-980
• 12/17
C. Constructing the Appliance Chase
A chase is a vertical box-like structure built to enclose the
gas appliance and/or its vent system. In cooler climates
the vent should be enclosed inside the chase.
NOTICE:
Treatment of ceiling firestops and wall shield
firestops and construction of the chase may vary with the
type of building. These instructions are not substitutes
for the requirements of local building codes. Therefore,
you MUST check local building codes to determine the
requirements to these steps.
Chases should be constructed in the manner of all out-
side walls of the home to prevent cold air drafting prob-
lems. The chase should not break the outside building
envelope in any manner.
Walls, ceiling, base plate and cantilever floor of the chase
should be insulated. Vapor and air infiltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air infiltration may be an issue, the inside surfaces may be
sheetrocked and taped (or an equivalent method may be
used) to achieve maximum air tightness.
To further prevent drafts, the wall shield and ceiling
firestops should be caulked with caulk with a minimum
of 300 ºF (149 °C) continuous exposure rating to seal
gaps. Gas line holes and other openings should be
caulked with caulk with a minimum of 300 ºF (149 °C) con-
tinuous exposure rating or stuffed with unfaced insulation. If
the appliance is being installed on a cement surface, a layer
of plywood may be placed underneath to prevent conducting
cold up into the room.
D. Floor Protection
NOTICE:
Install appliance on hard metal or wood surfaces
extending full width and depth.
DO NOT
install directly
on carpeting, vinyl, tile or any combustible material other
than wood.
WARNING! Risk of Fire!
Maintain specified air space
clearances to appliance and vent pipe:
• Insulation and other materials must be secured to prevent
accidental contact.
• The chase must be properly blocked to prevent blown
insulation or other combustibles from entering and
making contact with appliance or chimney.
• Failure to maintain airspace may cause overheating and
a fire.