permaculture

[Lawrence London <lfljvenaura@gmail.com>]

colder temperatures, more condensation therefore larget vent pipe needed
but install backflow prevention to keep outside air out

On Sat, Nov 19, 2016 at 12:54 AM, S P SHERMAN <spsherm@msn.com> wrote:

> I had a question on ventilation for a quasi root cellar I am building.
> It is a 6'x8' "room" in the NW corner of the basement level of a barn.
> Two of the walls are below soil level with concrete walls in direct soil
> contact, with the other two walls being framed 2x6 and insulated.
> Ceiling is 2x8 with insulation. The climate here is rather cold, US ag
> zone 5a, min winter temps of -20F and quite windy.
>
> I have read several books and article on venting root cellars, and plan
> on an intake vent in the NE corner at the floor level, and an exhaust
> vent in the SW corner of the ceiling. This should provide decent
> circulation inside the room, the question I have is on the sizing of
> these vents.
>
> Most sources recommend 3 or 4" diameter vents for a storage room of
> about this size. I am considering whether smaller diameter vents might
> be a better choice. My thoughts are that the 3-4" size would be good for
> purely passive ventilation in a less windy and milder climate, but with
> our winds and cold winter temps, smaller vents might be more
> appropriate. Less apt to freeze things if someone forgets to block them
> off during the cold/windy spells. The smaller diameter vents would tend
> to slow the cool down during the fall, but I am thinking that might be
> overcome with a few choice nights of venting possibly with the help of a
> fan.
>
> What do folks think? Anyone with root cellar ventilation experience have
> any thoughts?
>
> TIA
>
>
>
>
>
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-- 
Lawrence F. London, Jr.
lfljvenaura@gmail.com
https://sites.google.com/site/avantgeared