YouTube
LinkedIn
Twitter
Facebook
UPS
Sprinkler Saves

NFPA 13 (2016)

7.1.5 Air Venting
A single air vent with a connection conforming to 8.16.6 shall be provided on each wet pipe system utilizing metallic pipe.

8.16.6* Air Venting
The vent required by 7.1.5 shall be located near a high point in the system to allow air to be removed from that portion of the system by one of the following methods:

  • Manual vavlve, minimum ½" (15mm) size
  • Automatic air vent
  • Other approved means

Frequently Asked Questions

Can I test to 300 PSI?
Yes. Normal pressure testing can be done but first you must close all venting valves. The 7900AAV needs to be closed at the isolation valve.

Do I need to pipe PURGEnVENT to a drain?
No. There is no requirement to pipe an air vent, automatic or manual, to a discharge.

Why should I use this? What is the purpose?
NFPA 13 (2016) standard requires the use of one air venting valve per system. PURGEnVENT Air Venting Valves help reduce corrosion in the fire sprinkler pipe and help extend the life of your system by removing air. Air, water, and steel must be present for corrosion to occur.

Where should PURGEnVENT valves be installed?
The PURGEnVENT air venting valve should be located where it will be most effective. The vent required shall be located near a high point in the system to allow air to be removed from that portion of the system. If not possible, the 7950ILV can be installed after the floor control valve.

Can the 7900AAV be installed at an angle?
No. The 7900AAV needs to be installed vertically to properly vent air. However, when used with the 7950ILV a space saving option is to mount the outlet for the expansion chamber at a 45° angle with the 7900AAV in the vertical position.

How many do I need?
NFPA 13 7.1.5 states that a single air vent with a connection conforming to NFPA 13 8.16.6 shall be provided on each wet pipe sprinkler system. A system is defined as having a floor control valve, check valve, main drain valve, and flow switch. Multistory buildings shall have a system for each individual floor (8.2.4.1).

What if I can't access the highest point in the system?
The air vent should be placed near the highest point in the system. AGF also offers the 7950 Inline Vent that can be installed after the floor control valve.

Do I need to add a "Y" Strainer?
No. AGF has incorporated strainers into all PURGEnVENT valves due to inherent operational and maintenance flaws of "Y" type strainers.

Do I need an isolation valve before the air vent?
No. PURGEnVENT includes an isolation valve.

Can PURGEnVENT act as a vacuum break?
Yes. Opening the air vent will facilitate quicker draining of the system and act as a pressure break, preventing unneeded stress on pipe connections while eliminating a vacuum.

Why shouldn't I use an inspector's test as an air vent?
Inspector's test cannot act as an air vent because they cannot be placed at the high point of the system.

Does the 7910MAV stay open?
No. The 7910MAV is a manual air vent and must be in the closed position while the system is in operation. Manually open and close the 7910MAV valve repetitively to vent air from the system while it is in operation. Make sure to leave the 7910MAV valve in the closed position once venting is complete.

Does the 7900 Automatic Air Venting Valve leak?
No. A series of unique interior features prevent the 7900AAV from leaking. However, when filling a system water vapor may be expelled with the purged air.