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--- hvac:roof_vent [2020/04/06 13:11]
frater_secessus [sizing]
+++ hvac:roof_vent [2020/04/06 13:49]
frater_secessus [wind-powered 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 =====
@@ Line 15: / Line 15: @@
   * 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.
+===== installation =====
+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.
 ===== rainproofing =====
@@ Line 58: / Line 71: @@
 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))
-===== installation =====
+===== 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.
+==== 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.
-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.

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