I n n o v a t i v e M a r i n e P r o d u c t s f o r t h e I n f o r m e d S e a f a r e r - S i n c e 1 9 9 5
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3" plastic trans adapter for warm air. Need to transition your duct work through a bulk, or want to provide return air to a fan heater from a space other than where the fan heater is located. (no more stinky bildge air) This item is used to attach duct to/through a bulkhead or to a 3" computer fan on a fan heater for return air.
Not for high temperature systems.