So I had a chance to sit down and sketch out some simple ideas for my brew room ventilation. Here is what I cam up with:
So here's the general idea:
The layout on the left is a Top View of the room with the brew stand under the vent hood against the back wall of the room. To the right of the stand and hood will be the control panel mounted on the wall. Out of the front of the hood, on the far right side, will be a 6" PVC exhaust pipe that will extend straight outward then have a 90 degree elbow turning towards the glass block window. Just before the window I will have the Vortex VTX600 fan that Kal uses, pulling vent air through the tube. Immediately after the fan and before the window I will have a 6" to 4" PVC reducer to fit over a standard laundry vent in the glass block window. The fan is rated for 449 CFM so at this point with the one 90 degree elbow and reducer, we shouldn't be dealing with a whole lot of slow down in air flow.
The exterior options is where it gets tricky. In order to allow more airflow in through the window I have decided to add a rectangular vent window in the middle of the glass block, which leads me to the issue of recirculating the exhaust air back in the window when opened for make up air. My window will be set up just like this:
As you can see in the images to the right, my first idea is to have the 4" pvc coming out the window and then add another 90 degree elbow on the end of the tube after it exits the window driected to the right. This would help direct the exhaust gasses to the right and hopefully far enough away to keep most of the hot, humid air from getting sucked back in. The addition of one more elbow will add some more static pressure and slow down the airflow, but I hoping not much.
The second option, number two on the right, has a 90 degree elbow on the end of the 4" PVC pipe coming through the window pointed upwards. I would add another foot or so of 4" PVC pipe pointed upward, and then one more 90 degree elbow on the end of that pipe pointing to the right. The extra elbow on the top of the tube is added to prevent any rain from getting in the pipe, with the extra tube length to get the exhaust air further away from the make up air untake in the middle of the window. I was hoping that this set up would take advantage of the fact that hot air rises and by venting above the window it would decrease the risk of re-circulating the same air back in the room. The kicker here is that it adds another foot or so of 4" PVC pipe which is more constrictive then the 6" PVC pipe as well as another elbow. What I might gain in a less likely set up for re-circulating the exhaust air may result in even more of a drop in ariflow.
Anyway, long story short, what do you guys think of my options? I would like to try both and measure the drop in airflow from adding the extra pipe, does anyone know how to measure the CFM flow in duct work? Thanks guys!