How to Look

at a House

A blog with answers
to your questions about

More Blog Posts about Plumbing:

  1. What is the average life expectancy of PVC pipe?

  2. Why can’t PVC be used for water pipe inside a house?

  3. Should I upgrade to a tankless water heater?

  4. Why does my well pump turn on and off every time I use water?

  5. How old is that water heater?

  6. My air conditioner won’t turn on. What’s wrong?

  7. Should I wrap the water heater with an insulation blanket?

  8. What’s the powdery crust on the pipe connections at the water heater?

  9. Do you check the plumbing under the floor slab?

  10. Do I have polybutylene pipe? Why is it a problem?

  11. What is causing a foggy haze on my windows?

  12. What is that big thing in the toilet tank?

  13. How do I remove cigarette odor in a house?

  14. What is the difference between water service pipe and water supply pipe?

  15. What’s the flip-up handle on the water heater for?

  16. How come the water has a rotten-egg smell in some empty houses?

  17. My well water test came back positive for bacteria. What should I do?

  18. Do you test the well water?

  19. What is the difference between a regular water heater and a power vent water heater?

  20. How do you test a shower pan for leaks?

  21. Why is my water heater making strange (rumbling, gurgling, knocking or banging) noises?

  22. What is that pipe sticking out of the ground in the yard?

  23. Why are rubber washing machine hoses a safety risk?

  24. What are the most common plumbing problems with older houses?

  25. What is a heat pump water heater?

  26. What are the common problems to look for when the plumbing has been replaced in a house?

  27. What is a dielectric union?

  28. What is the average life expectancy of copper pipe?

  29. What is an auto vent, air admittance valve, or check vent?

  30. Why is a European-style bottle trap not approved by the plumbing codes in the U.S.?

  31. What is the average life expectancy of CPVC pipe?

  32. What is difference between a single element and dual element electric water heater?

  33. What are the requirements for installing a gas appliance connector?

  34. What is an escutcheon plate?

  35. Why is sunlight exposure bad for PVC pipe?

  36. What is the loose wire sticking out of the ground under the gas meter for?

  37. Is the hot water faucet handle required to be on the left?

  38. How can I locate my septic tank?

  39. What are the right words for talking about a house plumbing system?

  40. Should I seal the washing machine drain hose to the standpipe?

  41. How can I tell if a house is connected to a septic tank or sewer?

  42. What is a sediment trap or dirt leg?

  43. What is the purpose of a thermostatic mixing valve above a water heater?

  44. What is the minimum and maximum slope of the trap arm of a plumbing drain?

Welcome to our blog!
We want you to be an informed homebuyer, and each blog post is a question that we have answered for our friends and customers over the years. Hope they help you make a good choice for your next home.

     FVIR water heaters are specifically designed to prevent “flashback” vapor ignition fires in three ways:

  1. 1)Only one-way flow of air into the combustion chamber.

  2. 2)A flame arrestor plate to prevent any ignited vapor from passing out of the combustion chamber.

  3. 3)A sealed burner compartment door assembly.

    The American National Standards Institute (ANSI) established standard ANSI 21.10.1a-2002, effective July 1, 2005, that further defines the requirements and applies to all water heaters of 75,000 BTU or less.  Because FVIR water heaters have a closed combustion chamber, you can no longer open a panel at the base and reach in with a match to light the pilot.

    If any flammable vapors do manage to get into the combustion compartment, they are ignited in the sealed chamber, and the flame arrestor plate keeps any flames from escaping. Each manufacturer has their own slightly different design for FVIR safety, and they now have incorporated features that shut of the flow of gas and seal off the combustion air if a flammable vapor event occurs.

If you want to reproduce this blog post, please contact us for permission, attribution and link requirements.
While we hope you find this series of articles about home inspection helpful, they should not be considered an alternative to an actual home inspection by a local inspector. Also, construction standards vary in different parts of the country and it is possible that important issues related to your area may not be covered here.
©2015 - McGarry and Madsen Inspection.

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