What are these?

[rslaback]

Got these in a job lot at the auction house. Came with some large hose clamps. The 6" swivel damper is obviously HVAC but I can't say that I have ever seen an HVAC check valve and that is all I can think that the other things might be. You're looking at front and back on the similar sizes.

 

[NUTTSGT]

Back corner right is obvious a damper as you know. The other stuff look like they may prevent over-pressurization. . . Like a blow off valve.

Also moving to the HVAC sub forum. The guys here will probably be able to answer your question.

 

[danski0224]

Looks like a bunch of junk to me.

 

[fitter30]

Look like damper parts and damper sealing gaskets from either a fan terminal or a variable air volume box. These are use in commercial office buildings that take medium pressure air running a minimum of 1" at the furthest box. Each box has its own thermostat and is computer control energy management.

 

[rslaback]

Look like damper parts and damper sealing gaskets from either a fan terminal or a variable air volume box. These are use in commercial office buildings that take medium pressure air running a minimum of 1" at the furthest box. Each box has its own thermostat and is computer control energy management.

I found some other silicone parts that are labeled with a company that distributes hospital tube pneumatic tube systems. Dampers for those systems maybe?

 

[danski0224]

Blow off flappers. Not sure what the technical term is.