Field Controls 46334200 Instruction Sheet page 12

3" x 90° elbow - reduce vent length by 3 feet for each elbow
Standard 3" single walled galvanized venting or 3" Type B vent pipe should be used.
Draft Control Installation:
1. Install a 3" vent pipe tee of the same material as the vent piping 12" to 24" away from the
outlet of the boiler's blower. Then place a 3"X4" reducer in the tee for mounting the barometric
draft control as shown in the Figure below.
2. Seal the vent pipe tee and reducer using the sealing and joining procedures in the boiler
installation instructions. Seal the barometric draft control into the tee using the same high
temperature silicone as used on the vent piping.
3. The front face of the control MUST be plumb and the bearing surfaces MUST be level whether
the control is on a horizontal, vertical, or sloping vent pipe. Use a spirit level and level
accurately. If necessary, the control may be held in place by sheet metal screws.
Dunkirk instructions continued on next page.
Page 12