Sunline RV Forum
Sunline User Photos

Go Back   Sunline Coach Owner's Club > Technical Forums > Repairs and Maintenance
Click Here to Login

Join Sunline Club Forums Today

Thread Tools Search this Thread Display Modes
Old 08-05-2008, 06:41 PM   #1
Senior Member
henryj's Avatar
Join Date: May 2008
Location: Ontario
Posts: 641
SUN #597
Vent Lid or Maxxair

I need to replace at least one of the original lids on the 3 roof vents in our 2499 and am wondering whether I should replace all 3. I still don't have Maxxair covers so that also figures in the plans. I also intend to replace the little whizzer fan in the bathroom with a full size one, possibly Fantastic or Maxxair, but that won't happen before fall/spring.

Anyway, there seem to be $10 plastic covers and $20 polycarbonate ones. Any experience with the polycarbonate? Are they worth the extra money or will a Maxxair cover help preserve the cheap plastic ones. The extra cost of the polycarbonate almost buys me half a Maxxair cover already.


2019 F150 3.5L Max Tow
2015 Silverado 1500 NHT
2014 Arctic Fox 22G
2005 Sunline T-2499
henryj is offline   Reply With Quote
Old 08-05-2008, 09:37 PM   #2
JohnB's Avatar
Join Date: Nov 2006
Location: Ohio
Posts: 10,680
SUN #89
JohnB is on a distinguished road
Hi Henry

I have found that cheap vent covers still become brittle even when under a Maxx air cover that is untouched by the Sun effects. This happened on my T310SR.

I do not know if the cheap actually a defect or not. I happen to be a lucky one to get 2 batches of bad vents covers. During the 2004 year models Sunline changed vents suppliers. On my T2499, they started rusting within 1 year. Sunline was still in business then and they promptly sent me 3 new ones and I replaced them. However on the 2004 T310SR, well Sunline was not longer and I had to replace them. I went with Ventline. That trailer had Maxx Airís on it must have been since new. Yet the vent cover under it was crumbled into almost a 1,000 tiny pieces.

The Maxx air covers are worth the money. They plastics they use holds up to the Sun. I do put 303 UV protectant on the inside and outside of the Maxx Air and the new vent covers I installed.

Since I bought mine, I found Camco makes a vent cover replacement with a lifetime guarantee. If I would of known of that, I would of went with them.

The lifetime ones are listed as made out of polycarbonate. The also make a polypropylene but it does not have the lifetime warranty.

Polycarbonate is what Nalgen water bottles use to be made from or Lexan. Use to meaning they responded to the Bisphenol-A (BPA) situation where any food producers are now almost immediatly converting out of that plastic. However Polycarbonate is good stuff, just do not eat off of itÖ. Polycarbonate sheets are used for guarding in Industrial applications as it will not crack and when thick enough is very close to indestructible under semi normal conditions. If I remember right I though it would stop a 22 bullet.

Hope this helps


Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC

Google Custom Search For Sunline Owners Club
JohnB is online now   Reply With Quote
Old 08-06-2008, 06:42 AM   #3
Senior Member
pwb01's Avatar
Join Date: Apr 2007
Location: New York
Posts: 945
SUN #258
pwb01 is an unknown quantity at this point
I have 2 Maxxair covers, one with the fan. They look and work great. the fan moves a lot of air and I use it a lot dry camping. I did not get the one with the thermostat because I need to control the fan while drycamping. One big advantage to both is that the vents can remain open even in the rain so go for the day and don't worry about it.

For the original vent covers, I'd go with the better materials. Cheaper is not always inexpensive.

One caution on the bathroom vent. With a fan you're probably close to the black water vent on the roof so you probably can't bring air in, only exhaust.
Paul & Sheri - Upstate New York - SUN-0258
Amateur Radio KD2KCY - VHF 146.520 MHz
2012 F150 F/X 4, 6cyl EcoBoost, Max Tow pkg
2013 Rockwood 8280WS 5th wheel
2006 Sunline Solaris T-1950
pwb01 is offline   Reply With Quote
Old 08-07-2008, 08:09 PM   #4
Senior Member
henryj's Avatar
Join Date: May 2008
Location: Ontario
Posts: 641
SUN #597
Thanks for the info. I'm going to get 3 polycarbonate covers and one Maxxair cover for now. After our OR trip I'll get the Maxxair fan as I won't have time to install it now anymore.

2019 F150 3.5L Max Tow
2015 Silverado 1500 NHT
2014 Arctic Fox 22G
2005 Sunline T-2499
henryj is offline   Reply With Quote
Old 08-08-2008, 09:00 AM   #5
Senior Member
MACK C-85's Avatar
Join Date: Sep 2006
Location: Maryland
Posts: 1,130
SUN #64
MACK C-85 is an unknown quantity at this point
Two items from direct experience:

1. As someone has already said, if the vent is near the Black Vent Pipe, not just in the bathroom, it must be exhaust only. On our T-276SR the vent in the main compartment is less than 18" away from the black vent and Sunline would only install exhaust only.

2. Maxxair covers are not rain proof If a wind driven rain hits the "back" (louvered part) of the cover you will get water inside. We usually leave the vent open under the Maxxair to vent the coach. We had a severe thunderstorm that the wind blown rain was hitting the louvers and we had wet carpet, bed, etc. This has only happened once, but just be aware rain can get in them.

2004 Dodge Ram 2500 Club Cab 4x4 CTD
2007 Sunline Solaris T-276-SR: Misty Blue/Cherry
2001 Dodge Ram 1500 Reg Cab 4x4 OFF-ROAD
MACK C-85 is online now   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
to vent or not to vent while camper is just sitting here harbortj Repairs and Maintenance 12 04-08-2010 06:59 PM
MaxxAir Vents luckyva Sunline Community 14 04-22-2009 12:56 PM
Maxxair Vent nickster60 Modifications 7 04-18-2008 01:41 PM
Vent lid flaguy Sunline Community 6 06-05-2007 04:39 PM
solution to cleaning maxxair vent covers rich2500 Sunline Community 5 04-03-2007 04:13 AM

» Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by Sunline RV or any of its affiliates. This is an independent, unofficial site.

All times are GMT -6. The time now is 08:07 PM.