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VENTILATION in BUILDINGS
Heat recovery ventilator installation in a bathroom: This article describes the installation of an HRV over a bath shower. A reader questions handling the high moisture level created by the shower and whether or not this will be a problem for a conventional heat recovery ventilation system.
This article series explains how to install bathroom exhaust fans or vents, the vent ducting, the vent termination at the wall, soffit or roof, vent fan wiring, bath vent duct insulation, bath vent lengths, clearances, routing, and we answer just about any other bathroom ventilation design or installation question you may have.
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Question: installing a heat recovery ventilator over a bathroom shower: Brink Climate Systems Renovent HR installation specifications
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Eugene, I think we're discussing ceiling exhaust vents; placing one directly over the shower is fine and probably increases the ease with which it picks up moisture. Naturally one would presume that the installation is electrically safe from touch etc. (e.g. no switch is located where it can be touched from within the shower) and that water is never going to be sprayed onto the device.
An exhaust fan system that could not tolerate moisture would be one I would toss in the trash.
As an example we looked at Panasonic's installation manual for their ceiling mounted ventilating fan models FV05Q3 - FV15Q4. These models are UL listed for tub and shower enclosures.
That fan should not be installed where temperatures exceed 104 degF. and its duct runs should not be constricted (the instructions show examples of that snafu).
But there is no mention of NOT locating the fan where it is in fact most needed and most effective - over the moisture source.
You are discussing a different piece of equipment, not a bath vent fan but a heat recovery ventilating fan. That type of product is discussed at BALANCED VENTILATION found at inspectapedia.com/BestPractices/Ventilation_Balanced.htm
If you want to give us the brand and model we (or you) ought to be able to find the manufacturer's installation instructions to see what constraints apply. Certainly I could *imagine* that a HRV fan that has to handle high levels of moisture might not be designed for that application.
Thanks for your thoughts on this. I have read as much as I could about ventilation before doing this install at home and no other source has made an issue about putting an exhaust valve over the shower area but I just wanted to get another opinion just in case I missed something
I intend doing this tomorrow and I would not like to have to redo it later! The unit is a Renovent made by Brink Climate Systems with a heat recovery efficiency of about 90%. Their installation manual has nothing in it specific to bathrooms. There are no electrical connections at all associated with the valves as the air handling unit does all the work.
Looking at the Medium/Large installation instructions for the Brink Climate Systems Renovent HR, you will see that the unit has built-in frost protection that should mean it can handle moisture in the vented air.
• The appliance must be placed level.
But this feature may be important for your installation:
Input 0-10 V for a moisture sensor: When the moisture content in the dwelling increases, for in-
Now I read that as rather clear that the manufacturer anticipates handling moisture generated by a shower.
Some common sense about unit location to protect it from water, say from shower splashing, would of course be pertinent.
If you are considering the smaller Renovent you might want to review the features I've described with the manufacturer directly to see if they are needed for your installation.
You didn't indicate where you are located, but this may help:
For Ireland and Great Britain
(Apr 8, 2014) Eugene said:
I have still a long way to go but at least I can take one more thing off the list.
Continue reading at BATHROOM FAN ENERGY COST
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