20
Draft Hood
Draft Hood
Top of Heater
Screw
Vent to outdoors
or chimney
Screw
Vent
FIGURE 18. DRAFT HOOD ATTACHMENT
The vent pipe from the water heater must be no less
than the diameter of the draft hood outlet on the water
heater and must slope upward at least 1/4 inch per
linear foot (21 mm per meter). See
All vent gases must be completely vented to the
outdoors of the structure (dwelling). Install only the draft
hood provided with the new water heater and no other
draft hood.
Vent pipes must be secured at each joint with sheet
metal screws.
FIGURE 19. VENT PIPE MINIMUM UPWARD SLOPE
There must be a minimum of 6” (153 mm) clearance
between single wall vent pipe and any combustible
material. Fill and seal any clearance between single
wall vent pipe and combustible material with mortar
mix, cement, or other noncombustible substance. For
other than single wall, follow vent pipe manufacturer’s
clearance specifications. To insure a tight fit of the vent
pipe in a brick chimney, seal around the vent pipe with
mortar mix cement.
Failure to have required clearances between vent piping
and combustible material will result in a fire hazard.
Be sure vent pipe is properly connected to prevent
escape of dangerous flue gases which could cause
deadly asphyxiation.
Chemical vapor corrosion of the flue and vent system
may occur if air for combustion contains certain chemical
vapors. Spray can propellants, cleaning solvents,
refrigerator and air conditioner refrigerants, swimming
pool chemicals, calcium and sodium chloride, waxes,
bleach and process chemicals are typical compounds
which are potentially corrosive.
GAS PIPING
Contact your local gas service company to ensure
that adequate gas service is available and to review
applicable installation codes for your area.
Size the main gas line in accordance with
and
Summary of Contents for BT-100-LP
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