Gas Heat ESCO Practice Exam

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Type B vent pipe must be kept at least ____ from combustible materials.

one inch
two inches
three inches
four inches

The correct answer is: one inch

Type B vent pipe must be kept at least one inch from combustible materials to prevent fire hazards. Option B, two inches, may seem like a safer distance but it is not necessary for the pipe to be placed that far away. Option C, three inches, and Option D, four inches, are both too far away and may cause the pipe to be unstable or difficult to install. It is important to adhere to the minimum distance requirement to ensure safety and proper functioning of the vent pipe.