For anyone installing a roof fan in their Promaster, I highly recommend considering using Hein's adapter to make the install easy and fit snug.
https://www.ebay.com/itm/Promaster-Roof-Vent-Adapter-/142478235445
I went overboard with the sealant, but really didn't need much at all - the seal with the adapter is really snug.
Also - I used a low profile Fantastic Fan, purchsed from Vintage Trailer Supply, so that it ended up below the roof racks. Handy if you want to carry gear/boards on your roof over top of the fan.
https://www.vintagetrailersupply.com/Fan-Tastic-Fan-p/vts-414.htm
https://www.ebay.com/itm/Promaster-Roof-Vent-Adapter-/142478235445
I went overboard with the sealant, but really didn't need much at all - the seal with the adapter is really snug.
Also - I used a low profile Fantastic Fan, purchsed from Vintage Trailer Supply, so that it ended up below the roof racks. Handy if you want to carry gear/boards on your roof over top of the fan.
https://www.vintagetrailersupply.com/Fan-Tastic-Fan-p/vts-414.htm
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