Bard WG Series Installation Instructions Manual page 13

A minimum of 1" clearance must be maintained between the supply air duct and combustible materials. This is
required for the first 3' of ducting.
It is important to insure that the 1" minimum spacing is maintained at all points.
Failure to do this could result in overheating the combustible material and may result in a fire causing damage, injury
or death.
FIGURE 3
Combustible Clearance
WARNING
Manual 2100-587J
Page 13 of 59