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--- hvac:roof_vent [2020/04/06 17:11]
frater_secessus [installation]
+++ hvac:roof_vent [2022/11/22 08:38] (current)
princess_fluffypants [nonstandard vents]
@@ Line 4: / Line 4: @@
-The industry standard for RV roof vents is 14"x14".((http://www.arizonarvpartscenter.com/standard-14-x-14-rv-vent-lids-s/468.htm))  OEM vents are often substandard, lacking cowling around the fan that would move more CFM.
+The industry standard for RV roof vents is 14"x14"((http://www.arizonarvpartscenter.com/standard-14-x-14-rv-vent-lids-s/468.htm)) and can be as simple/inexpensive or fancy/expensive as one wants.
+See also [[hvac:roof_vent#nonstandard_vents|non-standard vents]] below.
 ===== placement =====
 There several and sometimes conflicting factors affecting vent placement.
-  * for effective **cross-ventilation** throughout the length of the van one would put the fan at the opposite end of the fresh air intake.  For example, if the front windows were to be cracked for inlet then the exhaust fan could be placed at the rear.
+  * for effective **cross-ventilation** throughout the length of the van one would put the fan at the opposite end of the fresh air intake.  For example, if the front windows were to be cracked for inlet then the exhaust fan could be placed at the rear.  Front-mounted fans would provide cross-ventilation if there were a window or [[http://img.mousetrap.net/pm/IMG_20170930_145340.jpg|passive vent at the rear]].
   * for **direct breeze at night the vent** might be placed in the sleeping area.((Or one might just use a portable fan for this.))
   * for **protection from rainfall** at night((no cover, or manually operated fans)), the fan might be placed away from the sleeping area
   * for **cooking exhaust** the vent would be placed over the cooking area.
+Some vans have flat (or flat-adjacent) areas to facilitate mounting fans.
+  * [[http://img.mousetrap.net/pm/IMG_20170722_101754.jpg|mounting pad]] on a [[rv:ram_promaster|Promaster]], just behind the cab
+  * [[https://d3eh3svpl1busq.cloudfront.net/hzvXwfprTLFDWPzjKPULBOlMxGOsXgwx/assets/static/source/rev-948a68b/wp-content/uploads/the_sprinter_vandal_373661446144_n.jpg|mounting pad]] on a [[rv:sprinter|Sprinter]] near the front and [[http://colemanfu.smugmug.com/Sprinter-van/i-TT2bHZJ/0/XL/CA_10211408262562-XL.jpg|also the mid/rear]].((dependent on body length?))
+  * The Chevy Express has a mounting pad in the rear.((https://www.sportsmobileforum.com/forums/f24/installing-roof-fan-in-ford-e350-2725-2.html#post41985))  Note:  older Chevy's may have one, too.((https://www.fordtransitusaforum.com/threads/location-for-maxxair-fan.25209/post-322786))
+If no entirely flat spot is available, one can cut through the corrugations and either use an adapter to seal the gaps or build up the low areas with buytl tape, etc.
+===== installation =====
+  * //radius// (round) the corners rather than leaving right angles to prevent stress fractures in the corners.  If you've already used a drill to make holes in the four corners you can [[http://img.mousetrap.net/pm/IMG_20170722_110807.jpg|leave a portion of the drill hole as a tiny radius]].((do a better job than me!  -- secessus))
+  * [[http://img.mousetrap.net/pm/IMG_20170722_120703.jpg|tape a bag around the perimeter inside the fan area]] to catch falling debris when drilling/cutting.
 ===== rainproofing =====
@@ Line 57: / Line 72: @@
 The base 3-speed Fantastic model reportedly consumes 1A, 2A, and 3A respectively.((https://www.cheaprvliving.com/forums/showthread.php?tid=24153&pid=296762#pid296762))
+===== nonstandard vents =====
+Although 14x14" vents are standard in the camper world, there are other (usually smaller) options. The smaller vents often have greatly-reduced flow, as measured in CFM((cubic feet/minute)). Some of the smaller ones give cubic feet measurements, //but are given for an hour//.  Example:  900 cubic ft/hour == only **15** CFM.
+'Dwellers looking to maximize solar real estate may be able to mount low-rise vents //under// raised solar panels.
+If you have a van with solid rear doors, or a van with a lot of space above the door windows, there are wall-mounted vent fans as well.  https://nomadicsupply.com/product/pika-van-outfitters-rvf-rear-vent-fan-system/
+==== mushroom vents ====
+RV-style mushroom vents are typically mounted in 5" to 6.25" holes.  They may be always-open or openable, [[https://amzn.to/2UPaOF0|powered]] or passive.  [[https://amzn.to/2UL5ulK|Solar powered versions]] exist.
+==== wind-powered vents ====
+[[https://amzn.to/39K80wV|{{ https://m.media-amazon.com/images/I/61kgY7E413L._AC_UY218_ML3_.jpg?125}}]][[https://amzn.to/39K80wV|Flettner-style vents]] use breezes (5-10mph+((https://www.flettner.co.uk/flettner-frequently-asked-questions/))) to power the vent.  Otherwise it acts as a passive vent.

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