7
TYPICAL VENT INSTALLATIONS
For optimum performance, it is recommended FIGURES 3 that all horizontal runs have a 1 inch rise per foot.
When terminating vertically, the vertical rise is a minimum 36 inches and a maximum 40 feet from the centre of the fireplace flue outlet.
SPECIAL VENT INSTALLATIONS
PERISCOPE TERMINATION
Use the GD401 periscope kit to locate the air termination above grade. The periscope must be installed so that when final grading is completed, the bottom air slot is located a minimum of 12 inches above grade. The maximum allow- able vent length depends on the fireplace, as illustrated.
FIGURE 4
