Fan ventilation direction - Dendroboard
Dendroboard

Go Back   Dendroboard > Vivariums > Parts & Construction
Register Blogs FAQ Calendar Mark Forums Read Advertise

Support Our Sponsors
No Threads to Display.

facebook

Like Tree2Likes
  • 1 Post By carola1155
  • 1 Post By senditdonkey

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 04-12-2013, 11:42 PM
blehrer's Avatar
Junior Member
 
Join Date: Feb 2013
Posts: 35
Thanks: 1
Thanked 0 Times in 0 Posts
Default Fan ventilation direction

I did some looking around and couldn't find a discussion on which direction people typically mount vent fans, and the pros and cons of each.

I believe the two would break down as follows, but am curious of everyone else's thoughts as well.

1. Fan blowing outside air into a viv would provide more of a "breeze", allowing for more direct evaporative cooling (assuming the outside air is more dry)

2. Fan removing air from the tank would create a more gentle air exchange, with the air replacing itself from other unsealed locations/vents.
__________________
Ben
85g vivarium, 0.0.4 Leucs
Reply With Quote
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-12-2013, 11:52 PM
carola1155's Avatar
Mod
 
Join Date: Sep 2007
Location: South Jersey
Posts: 4,945
Thanks: 141
Thanked 368 Times in 286 Posts
Default

The other option is having the fan just blowing around the air inside the tank, not aiming it through the vents. That is what I have done in tanks where I used a fan.

In aquarium style tanks that don't have the bottom vent allowing for passive airflow (and clean glass) I've set up fans that blow at the front glass to keep it clean of condensation and it generates air movement in the tank. There are a couple passive vents on top of the tank but I'm not directly trying to push air through them one way or another.

Generally, you don't really want to move air in and out of the tank in large quantities because you are (most likely) going to cause pretty wild fluctuations in humidity.
Pumilo likes this.
__________________
-Tom
Reply With Quote
  #3 (permalink)  
Old 04-13-2013, 07:24 AM
Member
 
Join Date: Jan 2013
Location: California
Posts: 173
Thanks: 6
Thanked 7 Times in 7 Posts
Default Re: Fan ventilation direction

I mount fans in the back top of the tank and point at the center of the front glass, only moving existing air inside tank. They are on timers and run sporadically during the day.

Tons of options, depending on what is in the tank.
Reply With Quote
 
  #4 (permalink)  
Old 04-13-2013, 01:51 PM
Member
 
Join Date: Dec 2012
Posts: 107
Thanks: 15
Thanked 3 Times in 3 Posts
Default Re: Fan ventilation direction

Yeah, most people don't use the fans to pull in air from outside, but rather circulate air inside so as not to drop humidity levels, but still clear condensation.

Air circulation for plants that require it like orchids is a little different. I'm not sure of those requirements - whether it needs to be fresh air or not...
Reply With Quote
  #5 (permalink)  
Old 04-13-2013, 02:26 PM
Dendro Dave's Avatar
Senior Member
 
Join Date: Aug 2005
Location: Oklahoma
Posts: 6,279
Thanks: 189
Thanked 630 Times in 431 Posts
Default Re: Fan ventilation direction

Quote:
Originally Posted by mkitchen View Post
Yeah, most people don't use the fans to pull in air from outside, but rather circulate air inside so as not to drop humidity levels, but still clear condensation.

Air circulation for plants that require it like orchids is a little different. I'm not sure of those requirements - whether it needs to be fresh air or not...
I do...or have that is...the one viv that had a fan went to some friends, but I ran a low power redsea maxx fan on a timer to come on for awhile every couple hours...get air exchange but you don't over dry the viv which can be an issue with blowing air out of or into the viv...timers are your friends
__________________
Everything I've ever written is/was just my opinion!
Reply With Quote
  #6 (permalink)  
Old 04-13-2013, 02:56 PM
blehrer's Avatar
Junior Member
 
Join Date: Feb 2013
Posts: 35
Thanks: 1
Thanked 0 Times in 0 Posts
Default Re: Fan ventilation direction

I'm in agreement that the outside air brings the added complication of humidity balance, but there has to be some added benefit to fresh air vs stale circulation... right?

Does this fall into the category of difficult, but beneficial, or do the cons outweigh the pros here?

In my particular case, I'm working with a show case paludarium, converted aquarium, with openings only at the top (and drainage bulkheads, that do not add to the air circulation. Technically, I am bubbling fresh air in through the water, which then becomes very humid/saturated, so an in tank circulating fan is all I really need, but are there any studies that show an optimal air exchange rate that we should all be trying to achieve (whether through venting or forced air options)? IE.. 25x air exchange/day, 1x/hr, etc.

Just curious, and hoping there are some scientific types on board that may have seen something or conducted their own unofficial studies.
__________________
Ben
85g vivarium, 0.0.4 Leucs
Reply With Quote
  #7 (permalink)  
Old 04-13-2013, 03:37 PM
Dendro Dave's Avatar
Senior Member
 
Join Date: Aug 2005
Location: Oklahoma
Posts: 6,279
Thanks: 189
Thanked 630 Times in 431 Posts
Default Re: Fan ventilation direction

Quote:
Originally Posted by blehrer View Post
I'm in agreement that the outside air brings the added complication of humidity balance, but there has to be some added benefit to fresh air vs stale circulation... right?

Does this fall into the category of difficult, but beneficial, or do the cons outweigh the pros here?

In my particular case, I'm working with a show case paludarium, converted aquarium, with openings only at the top (and drainage bulkheads, that do not add to the air circulation. Technically, I am bubbling fresh air in through the water, which then becomes very humid/saturated, so an in tank circulating fan is all I really need, but are there any studies that show an optimal air exchange rate that we should all be trying to achieve (whether through venting or forced air options)? IE.. 25x air exchange/day, 1x/hr, etc.

Just curious, and hoping there are some scientific types on board that may have seen something or conducted their own unofficial studies.
For me I have my fans blow in outside air just because it is simpler to setup...you don't have to worry about frog proofing/water/humidity proofing the fan/wiring. With timers and some good judgment it isn't hard to do with little worry of over drying things.

Also any fan in the viv is going to actually push air out if there is any ventilation...because it is going to increase the internal pressure of the viv, thus forcing air out whatever cracks/ventilation there is. So unless your viv is completely sealed I don't see the point of going through the trouble for minimal benefit when I can achieve good balance with timers.

In the end you'll get somewhat less humidity loss, but is it worth it? And is a sealed viv even with a fan inside really a good idea?
__________________
Everything I've ever written is/was just my opinion!
Reply With Quote
  #8 (permalink)  
Old 04-13-2013, 05:02 PM
Pumilo's Avatar
Senior Member
 
Join Date: Sep 2010
Location: Denver, CO
Posts: 10,041
Thanks: 813
Thanked 1,765 Times in 1,295 Posts
Default Re: Fan ventilation direction

I use passive vent strips on all my vivs, for air exchange. Some of my vivs also have internal circulation fans.
__________________
Doug
Questions are not ignorance. Questions are the birth of knowledge.
Reply With Quote
Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need some direction on venting/lid Saviorself Parts & Construction 12 01-09-2011 02:59 AM
Need a direction in Lighting xsputnikx Parts & Construction 8 12-16-2010 06:25 AM
Could you point me in the right direction, please? echoxxash Beginner Discussion 0 01-10-2008 05:18 AM
Point me in the right direction dopederson Food & Feeding 1 03-08-2007 05:30 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 11:59 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.