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APPENDIX 4 - INSTALLING THE FRESH AIR INTAKE KIT
During operation, the fireplace requires fresh air for combustion and draws air out of the house. It may
starve other fuel burning appliances such as gas or oil furnaces. As well, exhaust fans may compete for air,
causing negative pressure in the house, resulting in smoke entering the house from the fireplace. This
situation is aggravated in modern airtight houses. To overcome this problem, we strongly recommend that
you bring fresh air to the fireplace. Check with local authorities having jurisdiction in your area, it may be
mandatory.
Fresh air intake kit installation
Follow these instructions to install a fresh air intake kit
• The outside wall termination should be installed where it is not likely to be blocked by snow or exposed
to extreme wind and away from automobile exhaust fumes, gas meter and other vents.
• The insulated flexible pipe and the outside wall termination can be installed over or under the floor
level.
• The fresh air intake kit included with the fireplace contains the following components:
o One (1) 5" adaptor;
o One (1) air inlet block-off plate;
o Four (4) screws.
• The following components are not included:
o A 5" insulated flexible pipe (D) (This HVAC type pipe must comply to ULC S110 and/or UL 181,
Class 0 or Class 1 Standards and must withstand temperatures up to 250 °F;
o The outside wall termination (E);
o Adjustable clamps (2X) (C).
Note: Only remove the knock-out that will be connected to the fresh air inlet.
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• The insulated flexible pipe length (D) should be
sufficient and have a configuration to avoid
condensation.
• The outside wall termination (E) must not be
installed:
o At more than 50% of the total height of the
chimney;
o At more than 10 ft. (3 m) above the base of
the fireplace;
o At more than 3 ft. Below the base of the
fireplace.
• The fresh air must come from outside the house.
The air intake must not draw air from the attic, from
the basement, or from a garage.
HORIZON – Installation and Operation Manual
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