I recently purchased a Big Country 3250TS and the air conditioning air flow is inadequate in the bedroom (only one A/C unit). Am trying to figure out how/where to purchase closable ceiling vents to force more air into the bedroom at night. Closable vents in the living room would do the trick. But I have found that the ceiling vents in the Big Country are extra large....7 inches versus a 6 1/4 inch (approx) that you can buy at RV Supply stores. Any help or ideas to correct this problem are welcome. Thank you. Dennis