Lanair MXD300 - Manual (Page 15)

Section 3 - Chimney/Vent System
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General Requirements (cont.)
4. Install a U.L. listed barometric damper in the chim-
ney. Do not reduce or enlarge the vent pipe.
5. Do not use more than one 90° elbow. Each 90°
NOTE: Do not install chimney in front of the heater (in air stream of fan)
elbow equals a 10’ run of chimney. The maximum
run for the chimney connector is 30’.
6. To prevent the drawing of exhaust gases into the
building, keep the barometric draft control at least
24” from the heater, exhaust fan etc..
7. Position the draft control as shown. Barometric
Damper gate pins must be horizontal (Parallel to
the floor) for proper operation.
8. Secure all connections in the chimney connector with 3 screws per joint.
9. The chimney connector clearance to any combustible material is 18”. The “Class A”
chimney clearance to any combustible is 2”. Follow the chimney manufacturer’s
instructions.
10. Do not install heat re-claimers, manual draft controls, or any other type of restrictive
control in the chimney.
11. Install clean out tee with a cap, at the transition of the chimney. FOLLOW CHIMNEY
MANUFACTURERS INSTRUCTIONS.
12. Use “Class A” insulated chimney pipe to vent exhaust gases through wall, ceilings, attics,
roofs, combustibles, etc. Class A chimney must be used for the entire run once passing
through a wall of ceiling.
13. Vent chimney at least 3 feet above the roof and at least 3 feet higher than any portion
of the building, roof, or obstruction within 10 feet of the chimney.
14. The chimney cap should be at least 3’ above the chimney exit through the roof.
15. Do not use a rotating chimney cap. Use a non-restrictive “Class A” cap made for the type
“Class A” chimney you are using. Follow chimney manufacturer’s instruction.
16. The chimney must be capable of producing a negative -.02 W.C. draft when cold and -
.06 W.C. draft when hot. Refer to Section 4 Draft Instructions. Refer to Section 3.10 for
typical Chimney Installation.
HORIZONTAL
VERTICAL
NOTE: Barometric Damper may
be mounted horizontally or
vertically. Angle gate pins
must be horizontal for proper
operation
Barometric Damper Position