Automatic Vent Damper for Oil Burner?

[Mark & Mary Ann Weiss]

I see that Grainger has a Honeywell automatic vent damper, but it's
specified for gas use and only goes up to 6" diameter.

Does anyone make a vent damper like this for an oil fired furnace with 7"
flue?

These cold subzero days really cool down the boiler jacket temperature
rapidly. A damper could save a lot of fuel.

--
Take care,

Mark & Mary Ann Weiss

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[Roy Starrin]

I see that Grainger has a Honeywell automatic vent damper, but it's
specified for gas use and only goes up to 6" diameter.

Does anyone make a vent damper like this for an oil fired furnace with 7"
flue?

You can beat the subject to death here:
http://homeenergy.org/archive/hem.dis.anl.gov/eehem/96/960309.html

You could call these guys (no experience) and see if they can help.
They have an 800 number
http://www.partsguy.com/cgi-bin/PartsGuy/

Or you could just call any local oil furnace guys and ask.
I have an oil fired boiler and had an auto vent damper installed in
it's 7" flue years ago. Just looked, it has no name plate on it.
Best I can do.