what do you think?
- Thread starter gualapa
- Start date
gualapa
Member
yep, definitely have the room. I added your comments to the diagram, thanks
no topper but I topped them just for you
I switched up, no more cool tubes, 1 big fan, scrubber first. still need to decide whether to keep scrubber closer to lights to suck hot air right away or put scrubber up higher so it sucks air from ceiling area
gualapa
Member
ok I understand the drawing, but what are the benefits of having a cap 2 ft after takeoff & having the scrubber come after the ducting?
jrainman
Active Member
Grassgrower ther are a few reasons why this is done when moving air: first if you want to take full advantage of your 747 cfm we must create proper sizing of duct.
now that duct size is established we want to have enough volume so the fan does not starve for air.
also we want to create a nice flow of air as it enters or exits the duct (enter in this case)
notice how I used no elbows , did you know?, everytime a 90deg turn is put on ductwork , it is on average of like running 40feet of staight duct to a design. believe it or not ,but it is true .you wil also lose a lot by using only one intake over the fan with filter . the one I added will drag some intake air to the other side of the rm.
you can do as you wish with your room ,just offring my many many many yrs of HVAC exp. I see soo many of you spend good money on fans and filters and most here are lucky if they are getting 70% out of there design.
gualapa
Member
I understand completely but the exhaust needs to get into the ceiling or right near the ceiling, so if I don't do a 90 degree angle at the takeoff for the light, I have to do it later (maybe after the fan).
got a few questions:
1. How high from the light should the ducting begin? (if I should be putting higher up, I might not need a 90 degree angle duct piece)
2. As for the intake, are you saying I should remove the fan below the light so that the intake air can reach the other side of the room? Could I make a 2nd intake on the other side of the room? both intakes would take in air from the same room. I say this because I was told having a fan below the bottom light would help move the hot air from the lights up directly to the ducting.
3. Also, how does a damper help/would one be beneficial to my ventilation system?
4. What do you gain from having the duct run 2 feet past the light's takeoff (the cap)?
Thanks for your help, I appreciate it
jrainman
Active Member
1. 90 degs turn are ok ,but always use a few as one can
2. how high, duct hang height , how tall you gonna grow and take your light height in to that equation and hang at that height,
3. dampers is used to balance out the system ,by adjusting air intake of exhaust from diff locations , you will have less hot spots in rm (even temps through out)
4. 2ft rule this will give you volume so fan does not starve for air and also the air flow will be much smoother as it enter the 10'' main duct from your 2 transition branches 6'' and 8" . Why do you think NASCAR teams spend hundreds of thousands of dollors expermenting with body styles in wind tunnels with there cars.
You are welcome ,but Like I the choice is yours just.
gualapa
Member
gotchya. last question- so about the intake situation: I understand you're saying the small fan below the lower bulb would disrupt the intake air from getting to the other side of the room. Should I make two vents or would this be inefficient? I want to keep the small fan under the light in order for it to act like an "invisible cool tube" by pushing the hot air emitted from bulbs straight up towards the light's takeoff. I could also move the intake to one of the adjacent walls.
Also, I guess you adjust the dampers by checking both areas below the dampers to make sure they are somewhat even in temps?
Updated my design with your suggestions:
