Recognize This Air Vent?
Rusted & difficult to read, but would def like to replace with same size/exact model if possible...
Thanks fellas,
Gregg
Comments
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I'd bet @Steamhead knows what it is.
Curious, why do you want to replace it with something the same size and exact model?
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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I think it says Hoffman Specialty 74 on the side .
There was an error rendering this rich post.
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You will need a bigger vent, maybe more than one. Try a big mouth from the store here.
what size are the mains which this handles?--NBC0 -
Answering ChrisJ, I'm going same size/model or similar so I don't screw it up, they probably sized it correctly.
Thanks Bob you're right about the Hoffman Specialty.
Nicholas, why do you think the system needs a bigger vent or multiple?
Thanks fellas,
GREGG0 -
Perhaps if it was originally coal fired it was correct, but I highly doubt it is enough venting with a modern boiler. You should measure the length and size of your mains and post it, we will be able to recommend how much venting you may need.BuildingOpsGregg said:Answering ChrisJ, I'm going same size/model or similar so I don't screw it up, they probably sized it correctly.
Thanks Bob you're right about the Hoffman Specialty.
Nicholas, why do you think the system needs a bigger vent or multiple?
Thanks fellas,
GREGG0 -
Answering KC Jones:
Roger that, heading over now, will grab a tape and post more details, thanks KC!
-BuildingOpsGregg0 -
That's a Hoffman #74 vent. Not right for a Main vent anyway. The #74 is designed as a steam heater vent. The #75 is the correct vent for a main but it is probably way to small for the average Main.0
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What's a "Steam heater vent" ???Fred said:That's a Hoffman #74 vent. Not right for a Main vent anyway. The #74 is designed as a steam heater vent. The #75 is the correct vent for a main but it is probably way to small for the average Main.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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It has a drop away and operating pressure of 35 PSI.ChrisJ said:
What's a "Steam heater vent" ???Fred said:That's a Hoffman #74 vent. Not right for a Main vent anyway. The #74 is designed as a steam heater vent. The #75 is the correct vent for a main but it is probably way to small for the average Main.
http://www.supplyhouse.com/Hoffman-401429-74-1-2-x-3-4-Straight-Steam-Unit-Heater-Air-Valve-11740000-p
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Maybe think of a hanging fan forced steam coil/fins unit heater.0
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Correct. What pressure does your system run?All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0
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