I will look for some replacement vents that I can close, hopefully, made out of metal. The ones that came with the TT are plastic. I did not realize that they were a standard size item.
Do you take your shoes off at the door? We do and it confines the dirt there instead of tracking it all over the RV.
If you get closable (sp?) vents keep them open when using the furnace. I think it's OK to close one of them partway.
Dick_B
2003 SunnyBrook 27FKS
2003 3/4 T Chevrolet Suburban
Equal-i-zer Hitch
One wife, two bikes (both Electric Schwinn's with motor assist)