Originally Posted by
angusparker
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I would say if you are drawing air from inside the house the intake fan is not necessary. What is key is the air path to come in above head height and to be drawn out from just over the trays far below nose height. You will most likely need a soffit and light tight louvers to get the air in across from the trays and uptake vent so you have positive air movement from top of back of your head to tray and out.
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Thanks so much angus.
Great help.
As for passive air inlet(or passive light tight louvres) instead of active Positive Pressure Fans, it could help in better exhaust flow, but I do not think this will help the purpose of the design.
I adopted the Positive Air Pressure because I believe it's the best way to get rid of dust.
Then, I chose Inhouse Air(instead of outside Air at window area), because Inhouse Air is clearly much less dust born, plus the fans are high in the door well above the ground level of the house. I do not know so far how can I get filters that could fit in Doran fan?
As for the pressure gradient, I revisited my primary design, thanks.
Please see the drawing below, thanks everybody for the comments.
The intake fans will be at least 72" above the ground of the room, this is the maximum usable height for the door, but will use angled 6" tube(Doran specific size) to direct Positive Pressure Air up higher than the level of the door(up to 100" above room ground level, as needed, but I will consider not to add much of dead space[tube length] to conserve power of positive air flow).
At the same time, I owered the level of the bigger Exhaust Fan to be 50" from ground level. Planning to make the sink low to approach it on a chair, which the case for all smaller prints.
Appreciate your input angus.
Intake door fans can be extended higher than 72"
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