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MorrHeat - Most Heat In The Industry - Rev 3/18/2019
Venting
Installation
1. When installing the vent pipe, be sure all connections are fastened correctly to insure no
leaks and proper draft is achieved. Minimum draft through the unit is, -.02- with draft
meter. Draft up the stack must be -.04 to -.06 inches of water column when checking a
draft meter for proper draft readings.
2. If proper or desired draft isn’t easily achieved, a third party draft inducer or power vent
may be needed to prevent back draft from occurring (not provided).
3. Install a barometric damper (NOT included) in the stack only if the draft up the stack
exceeds -.08. Draft up the stack must be -.04 to -.06 inches of water column. Check with
draft meter between the top of the boiler and damper. The draft should be a minimum of
-.02- checked through flame inspection port.
4. Keep the draft moving. If draft is too slow or bottles up, this could create a back draft and
over-fire or over heat the unit. If a damper is present, losing the damper will increase draft
make sure passageways are clean and clear.
