Damper - page 3

What Better Source for FanDampers than the
Original FanBuilder. The sameManufacturing Skills,
RuggedConstructionand Industrial Quality that’s Included
in Every Chicago Fan is Built Into Every ChicagoDamper.
Pre-Spin Inlet Box Dampers
Theobjective toalter fanperformance is similar to the IVC.
Double surfacedblades arewelded to full lengthaxles and
openand closeparallel toeachother.Whenpartially closed,
flowandpressure is reducedas theblades pre-spin theair into
the fanwith the same rotationas thewheel. Louveredblades
are fully containedwithinaheavy-duty, formed steel channel
framewith theaxles parallel to the fan shaft.
OpposedBlade Inlet Damper
In certainapplications, fans areequippedwithopposedbladed
freshair inlet dampers. When closed, theblades provide for a
straight flowof air towards the fan.Thesedampers are typically
used inboiler applications, andhelp to induce recirculated flue
gas (FGR) back into the fan’s inlet airstreamby creatingaback
pressure.
Both types of inlet box dampers differ fromthe IVC in that the
bearings areoutside theairstream, allowing for higher tempera-
tures anddust ladenapplications.For installations inexcess of
200°F, dampers rotate through long lifepillowblock bearings
mountedon stand-off channels, andprotectedby stuffingboxes
withbraided fibrous packing toprevent leakageat the shaft holes
in the frame.Blades, axles and frames canbe coatedwithany
number of coatings, or constructedofmild steel, or 304and
316 stainless steels.
Butterfly dampers areused for control and isolationof various
gases in roundducts.They canbemade tomatch standardor
ANSI flanges ranging from12" to48" openings.Aheavy single
thickness blade iswelded toaheavy stub shaft.The shaft rotates
through long life flangedbearingsmountedon stand-off channels.
Openings areprotectedby stuffingboxeswithbraided fibrous
packing toprevent leakageat the shaft holes in the frame.Blades,
axles and frames canbe coatedwithany number of coatings,
or constructedofmild steel, or 304and316 stainless steels
dependingon the temperatureandapplication
ButterflyDampers
Inlet Box LouvreDampers
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