Installation Guide

Technical Bulletin
www.heat-fab.com [e-mail]
3 of 6 413.863.2242 800.772.0739 fax [phone]
R1207 130 Industrial Boulevard Turners Falls MA 01376
 When assembling elbows and tees, the male end tabs will rotate around the vent to accommodate
offsets and direction changes.
 Position the Mechanical Locking Strap over the Tabs, making sure each slot encompasses both
Tabs, and then tighten.
 Center the Coupler Band around the completed joint and tighten.
• DO NOT use screws or pop rivets when joining Saf-T Vent systems! EXCEPTION: Saf-T Vent SC is
designed to be assembled with the use of tap screws, which are included with each part.
5. Get Going in the Right Direction – Follow the Flow Arrows.
• Every length of Heatfab vent has a product sticker with an arrow showing the direction of flue gas flow.
• The tapered ends of the Saf-T Vent parts are designed to help drain condensate back to the
appliance. Although the direction of the tapered ends will seem backward for smooth airflow, don’t
worry. It’s more important to remove the condensate from the system.
• Line-up the seams – makes a good-looking job!
• Turn the seams up towards the ceiling when installing horizontally.
6. Maintain Proper Slope.
• Install with a continuous ¼” per foot (minimum) slope, as is required by the National Fuel Gas Code for
all gas-fired appliances.
• Vent systems for condensing appliances must have a continuous ¼” per foot (minimum) slope toward
the appliance or a condensate drain. Always check the appliance manufacturer’s instructions for
proper drain requirements.
• Some appliances require the venting system to be sloped toward the horizontal termination.
• Remember, if you raise the appliance or lower the ceiling you must adjust the slope of the vent to
maintain the ¼” per foot minimum.
• Use the chart below to help plan your system.
Horizontal
Length
Flue Pitch Horizontal
Length
Flue Pitch Horizontal
Length
Flue Pitch
1 foot ¼ inch 11 feet 2 ¾ inches 21 feet 5 ¼ inches
2 feet ½ inch
12 feet*
3 inches 22 feet 5 ½ inches
3 feet ¾ inch 13 feet 3 ¼ inches 23 feet 5 ¾ inches
4 feet 1 inch 14 feet 3 ½ inches
24 feet*
6 inches
5 feet 1 ¼ inches 15 feet 3 ¾ inches 25 feet 6 ¼ inches
6 feet*
1 ½ inches 16 feet 4 inches 26 feet 6 ½ inches
7 feet 1 ¾ inches 17 feet 4 ¼ inches 27 feet 6 ¾ inches
8 feet 2 inches
18 feet*
4 ½ inches 28 feet 7 inches
9 feet 2 ¼ inches 19 feet 4 ¾ inches 29 feet 7 ¼ inches
10 feet 2 ½ inches 20 feet 5 inches
30 feet*†
7 ½ inches
* A Horizontal Support is required every six feet and after every elbow or offset.
† A Condensate Drain is required every 30 feet.