Outdoor intake screening

Heating · How They Work · printed page 191 (PDF page 192)

Book index entries

Intake Screening for Combustion Air Outdoor Intake Screening for Combustion Air for Fireplaces Screening for Combustion Air Intake for Fireplace Wood Fireplaces

Text in the illustration

chimney
check the outdoor air intake for screening
the intake should be at least 12" off the ground (more in heavy snow areas)
exterior wall
wall framing
firebox
air inlet
floor joist
cross section through chimney
chimney foundation
combustion air
insulation
outdoor air intake

Generated explanation

The illustration shows a cross section through a masonry fireplace and chimney with an outdoor combustion-air supply duct. The duct passes through the exterior wall below the floor framing, runs through the chimney foundation, and turns upward to an air inlet at the base of the firebox. Arrows indicate outdoor air flowing toward the fireplace, and insulation is shown around the horizontal duct. An annotation directs the inspector to check the outdoor intake for screening and specifies a minimum height of 12 inches above ground, with greater clearance in heavy snow areas.

Components

masonry chimney firebox fireplace air inlet combustion-air duct outdoor air intake duct insulation chimney foundation floor joists exterior wall wall framing

Materials

brick masonry concrete wood framing insulation