FloAire Indirect Fired Heater - Manual (Page 7)

August 2009 Rev. 15
Indoor Flue Venting
Indoor gas fired heating equipment must be vented. Do not operate un-vented. Gas fired heating
equipment which has been improperly vented, or which experiences a blocked vent condition may emit
flue gases into heated spaces.
1. Installation of venting must conform with local building codes, or in the absence of local codes,
with the National Fuel Gas Code.
2. Do not use a vent pipe smaller than the size of the outlet on the heater.
3. Reference Table 2.1. Length of horizontal vent pipe should not exceed the values given in this
chart based on Model size. Install with a minimum upward slope from unit of ¼ inch per foot and
suspend from overhead structure at points no greater than 3 feet apart. For best venting, put as
much vertical vent as close to the unit as possible.
4. Fasten individual lengths of vent together with at least three corrosion resistant sheet metal
screws.
5. Vent pipes should be fitted with a tee with a drip leg and clean out tap at the low point in the vent
run. This should be inspected and cleaned out periodically during the heating season.
6. Do NOT use dampers or other devices in the vent or combustion air pipes.
7. Use a vent terminal to reduce downdrafts and moisture in the vent line.
8. When venting into a common vent, the individual vents should enter at different levels. The area
of the common vent should be equal to or greater than the area of the largest vent plus 50% of
the area of all additional vents.