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Message: <blockquote data-quote="Rojas" data-source="post: 31902" data-attributes="member: 2183"><p>Hey, your workmanship looks pretty good on that plenum! One improvement would be to have a straight section ~.75" to transition to the included angle. In the grand scheme of things it's probably trivial point. Might keep it in mind if you make another. Might be worth a few percent. To make the fans run faster you will need to increase the voltage. It's not really practical in your application. It can be a good way to determine the fan operating point required. You can attach an external power supply to the fans and increase the voltage until you get the heat rejection you need. At that point you record the fan speed and current. You really need to be working with a fan supplier or have some known system characteristics or a way to measure them. And be advised, you can toast the fan motors really quick this way. That's the reason I inquired as to your location. I've got the equipment to be able to determine the fan characteristics required without going through allot of iterations (money). I recommended the Spal fan as a starting point because I've tested enough of them know their fans preform in line with their data sheets. In the high performance line they have a VA02-AP70/LL-40S FAN (9" HP) and VA15-AP70/LL-39S FAN (10" HP) pusher fans. At 20mm of static pressure they move 580 and 860 Meters3/hour with power consumption of 150 and 180 watts respectively. It appears Spal sells these fans direct from their website for 172.00 each. I saw lower prices from some of their distributors. If it were me I'd look for someone who would let me return the fans, no questions asked, if they did not work for my application. That way you could try the 9" fans that should mount directly to your plenum and the power consumption is lower. My recommendation is based on the assumption that the fans you have now are ~90 watt Denso units. Can you measure the current and voltage on one of the fans you have now? I don't believe adding the thermostat is going help. It needs to be in the system but mass flow is mass flow. You will probably see some reduction in heat rejection.</p></blockquote><p></p>

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