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85-03-01096
VENT HEIGHT ABOVE FIREPLACE
The vent box must be located at least 30 inches and up to 12 feet above the top of the fireplace. To meet the minimum
height requirement when framing for the vent guides the bottom framing 2x4 must be at least
24” above the top of the
fireplace.
HORIZONTAL OFFSET
When the vent box is placed in a location that requires the flex vent to be offset horizontally, a maximum 45° or 1:1 rise to
run ratio must be maintained. This is to insure adequate air flow through the vent system. Support diagonal sections of the
flex duct
with strapping every 24” to keep the flex duct from drooping.
Содержание AA-11-03781
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