AAV Survey Respondents’ Write-in Comments

Regardless of whether you do or do not use AAVs, what disadvantages do you see them having?

• Cannot handle pressure release
• Not trustworthy
• Air flows in one direction only
• People try to use them in context of venting
• Have not experienced any negative aspects
• Subject to mechanical failure
• No major disadvantages
• Only use as a last resort
• Do not work in a positive pressure condition
• They don’t equalize the system
• Acceptance by folks in industry
• Wonder about long-term function
• No disadvantages
• Fail after a period of time
• Since device is mechanical it will eventually fail
• Misapplication is easy
• They all fail sooner or later
• Don’t compensate for positive pressure surges
• It is mechanical—it will fail someday
• Strong craft lobby against use
• Misunderstood by code officials
• Typical vent system still works
• Limited applications
• No positive pressure relief—failures common
• Owners uninformed and difficult to convince

Regardless of whether you do or do not use AAVs, what advantages do you see them having?

• Good alternative for island sink vents
• None
• Best use in retrofit where adding vent not possible
• Much better than island vent requirements
• Prevents exposed vent piping in open areas
• Install in island conditions
• Might be the only option for venting
• Niche product
• Good solution for difficult venting situation
• Only thing that works in certain areas
• They are an option
• Can provide means of venting where conventional venting is not feasible
• Necessary in some locations where vent cannot be routed
• Island venting
• If it suits the application, use them
• Island type venting, perfect
• Cost
• Gives designer an option for situations where conventional vent is not workable
• It all has to do with application and cost evaluation of product
• Eliminates sewer odor problems from the roof
• Better trap seal protection
• Allows certain fixture locations to be more flexible
• Can be installed where conventional vent piping is not possible
• More work to replace a conventional system especially remodeling
• Less piping to lay out
• Don’t know much about them
• Possibly reduce pipe venting requirements
• Labor saver
• Difficult venting fix
• Good for low-wall situations where wall doesn’t go to ceiling
• None—creates poor system function
• Because I don’t have a wall to place a vent!
• Control gas odors at grease interceptors and sewage pits
• Do not use AAV as basis of design, only use in retrofit situations
• Use only if we can provide a vent
• Eliminates vent piping
• Solves some problems with minimum cost and disruption