Heatilator • Novus NBV • 4055-188 Rev C • 04/08 9
B. Construct the Appliance Chase
A chase is a vertical boxlike structure built to enclose the gas
appliance and/or its vent system. Vertical vents that run on
the outside of a building may be, but are not required to be,
installed inside a chase.
Construction of the chase may vary with the type of build-
ing. These instructions are not substitutes for the require-
ments of local building codes. Local building codes MUST
be checked.
Chases should be constructed in the manner of all outside
walls of the home to prevent cold air drafting problems. The
chase should not break the outside building envelope in any
manner.
Walls, ceiling, base plate and cantilever fl oor of the chase
should be insulated. Vapor and air infi ltration barriers should
be installed in the chase as per regional codes for the rest of
the home. Additionally, Hearth & Home Technologies recom-
mends that the inside surfaces be sheet rocked and taped
(or the use of an equivalent method) for maximum air tight-
ness.
To further prevent drafts gas line holes and other openings
should be caulked with high temp caulk or stuffed with un-
faced insulation. If the appliance is being installed on a ce-
ment slab, we recommend that a layer of plywood be placed
underneath to prevent conducting cold up into the room.
Fire Risk
• Construct chase to all clearance
specifi cations in manual.
• Locate and install appliance to all
clearance specifi cations in manual.
WARNING