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greenhouse ventilation

Post  minervalong on 4/7/2013, 11:43 am

Finally the greenhouse is under construction!! Yippee!! I have the plans all drawn up and actually have two posts in the ground, never thought to be so excited about two posts but there it is. Does anyone have any suggestions about ventilation? I had thought of a gable fan in the east end to draw through the west end doors, but am now considering a powered roof vent with thermostat. I would appreciate any opinions from other greenhousers.
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Re: greenhouse ventilation

Post  Turan on 4/7/2013, 1:27 pm

O! I am digging a trench and holes for posts right now! Its greenhouse building season, trying to get her done before the tomatoes need her.

My old one had a door on the north and a big window on the south, lots of cross ventilation. It also leaked like a sieve so maybe ventilation was never an issue with it Shocked This new one will have doors on the north and roof vents. I am worrying that might not be enough. So I am going to put a foundation vent at floor level on the south side. I am thinking to get one of those Solar-Powered Vent Opener

I hope lots of more experienced greenhousers will speak up.

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Re: greenhouse ventilation

Post  Lindacol on 4/7/2013, 2:08 pm

@Turan wrote:O! I am digging a trench and holes for posts right now! Its greenhouse building season, trying to get her done before the tomatoes need her.

My old one had a door on the north and a big window on the south, lots of cross ventilation. It also leaked like a sieve so maybe ventilation was never an issue with it Shocked This new one will have doors on the north and roof vents. I am worrying that might not be enough. So I am going to put a foundation vent at floor level on the south side. I am thinking to get one of those Solar-Powered Vent Opener

I hope lots of more experienced greenhousers will speak up.

Curious about why you would use such a vent at floor level?
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Re: greenhouse ventilation

Post  Turan on 4/7/2013, 2:17 pm

Cross ventilation. Cool air from ground level coming in while hot air exits from the roof vents. It will be on the south, so not as cool as the door open in on the north, but there is a rose bush right in front of where it will be. I had to split the rose bush to make room for the greenhouse.

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Re: greenhouse ventilation

Post  Lindacol on 4/7/2013, 2:24 pm

@Turan wrote:Cross ventilation. Cool air from ground level coming in while hot air exits from the roof vents. It will be on the south, so not as cool as the door open in on the north, but there is a rose bush right in front of where it will be. I had to split the rose bush to make room for the greenhouse.

I understand that. But doesn't the vent in the link open when it gets warm? I just thought it would be used as a roof or at least high window vent. I really have no idea.
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Re: greenhouse ventilation

Post  Turan on 4/7/2013, 2:36 pm

I gave a link for the roof vent opener because that seemed to be what the OP thinking about. I want to use one on my roof vents. I am pairing that with the automatic foundation vent


Last edited by Turan on 4/7/2013, 2:38 pm; edited 1 time in total (Reason for editing : editing because coherentcy seems a very long stretch right now. I am gonna go find more coffee)

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Re: greenhouse ventilation

Post  minervalong on 4/7/2013, 2:49 pm

Yes, I am going to have low side vents on the northwest, that will draw air from the cool shaded side. I think the powered roof vent (like you put on houses) would be on the northeast end, as close to the roofline as I can get. Since it will be a tin roof the vents have to be put in on original construction, don't think I could get the dear hubby to retrofit. Maybe I should design the east end for adding another fan later?
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Re: greenhouse ventilation

Post  Lindacol on 4/7/2013, 3:14 pm

@Turan wrote:I gave a link for the roof vent opener because that seemed to be what the OP thinking about. I want to use one on my roof vents. I am pairing that with the automatic foundation vent

Gotcha - that makes sense.
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Re: greenhouse ventilation

Post  minervalong on 4/7/2013, 8:15 pm

Ok, I have been looking at exhaust fans that are available. The greenhouse is 15 x 22.5 saltbox, south side 9 ft tall, roof apex 12 ft. and north wall 7 ft. This gives me about 4000 cubic foot. Even the biggest fan at lowes only vents 2100 cf. Will I need 2?
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Re: greenhouse ventilation

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