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OUTSIDE AIR KIT INSTALLATION
Outside air kits are an optional accessory that can be added to a FireRock fireplace to supplement combustion air. Outside air kits
should be installed and used in accordance with requirements of the standard for fireplaces under national code NFPA 211. Follow
manufacturer’s instructions for installation instructions and refer to local building code for proper sizing; UL 127 standard says the
cross-sectional area of the air inlet must be 50% of the cross-sectional area of the flue or 25 in
2
, whichever is smaller.
Figure 13 below shows approximate placement of an outside air kit within the FireRock fireplace. Install in the side wall of the
fireplace as far forward as possible in the third course of firebrick. Cuts can be made prior to installation of side blocks.
FireRock recommends running two (2) outside air kits for oversized units to ensure adequate supplement combustion air is
supplied.
FireRock recommends a licensed HVAC installer run the intake pipe.
The outside air kit must terminate near a fresh air source. Do not terminate in a closed space (e.g., an attic, crawl space, or
basement) or near combustibles. Failure to terminate the outside air kit near an open fresh air source can cause smoke and
hazardous gases to fill the house.
Do not use combustible material in the construction of a passageway for an outside air kit. Using combustible materials in the
construction of the passageway may result in a fire or explosion, causing property damage, personal injury, or loss of life.
FIGURE 13
