Brant Radiant Heaters DX2 Series Manual page 31

DX2 Series
Horizontal Venting (Category III)
An appliance that operates with a positive vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent is said to be "Category III". The heater is
considered a Category III appliance if the venting system meets all of the following criteria:
• The vent system terminates horizontally (sideways).
• The vent terminates vertically, but the length of the horizontal portion of the vent run exceeds 75% of
the vertical rise length. (e.g.- If the vertical vent height is 10 feet, the horizontal run is greater than 7
1/2 feet).
• The vent terminates below 5 feet of the vent connection on the unit.
• Horizontal venting sections of the vent pipe must be installed with a downward slope from the
appliance at a pitch of 1/4 inch per foot.
Vent enclosed spaces and buildings according to the guidelines in this manual and applicable national,
state, provincial, and local codes.
The venting system must be provided by the installer and should be comprised of single-wall venting
materials with a thickness of no less than 26 gauge. All joints must be sealed with a high temperature
silicone sealant approved for at least 550°F using a minimum bead of 1/4" x 1/4", and fastened with at least
three corrosion resistant #8 sheet metal screws evenly spaced.
One continuous section of double-wall B vent or Duravent PVP vent may be used to pass through a
combustible wall or barrier, or the installer may continue to use single-wall vent provided a combustible
wall thimble is used which provides adequate clearances to combustibles.
All horizontal Category III vents must be terminated with a Simpson-Duravent sidewall vent cap (P/N:
SWD-4 for 4" venting and P/N: SWD-6 for 6" venting).
IMPORTANT! Once all silicone sealant has fully cured according to manufacturer's instructions, the
installer must perform a leak test on the complete venting system. A solution of soap and water may be
used to test the venting inside the occupied space. Once the installer has verified the venting system is
completely sealed and free of leaks, the heater may be placed into operation.
3.0 Installation
31
• Horizontal Venting (Category III)