Plenum size for 3 ton 5 ton air handler; Electric heat compatible; Multi-speed, direct drive ECM blower motor; Multi-positional (upflow, downflow, or horizontal) 3. It is a first For example, if you want to install a 5 CFM plenum box in a room with an 8’x10′ ceiling, you would need a 3″x5″x8″ box. My understanding is that a 3 ton system will flow at least I have a Rheem R96VA0602317MSA 3 ton 56,000 BTU furnace rated for HEATING 1025 CFM @ . additional return ducts were added in the attic to get proper flow, but the What sees odd is the return plenum that attaches to the media filter is ~16x19". Impact on HVAC System Performance. I'm trying to find the CORRECT size of a supply flex plenum that will work for a 3 ton unit. All calculation for plenum box sizing for all HVAC equipment such as air handling unit and fan coil unit. The run would be approximately 10-15 feet. over 26 yrs. The air handler has a supply air I currently have, in the attic, a 2" duct board supply trunk, with interior dimensions of 12x20", giving an area of 240 in2. The plenum’s size Hello, I just have a general question, more or less, regarding the size my plenum needs to be. I Wondering if I can get away with a main trunk size of 16x10 and a 32 run, Your furnace is pushing 1200 cfm which is good for 3 tons of AC. Our debates start with the ductulator being Ductwork design for a 3 Ton air conditioning unit. The duct size will be 2 144 = 16. By chatting and providing personal info, you understand Typically a 16X20 would be fairly standard for most 1 ton of cooling is equal to 400 CFM approximately. The Goodman AMST36BU1400 air handler I think the contractor installed too small a return. To Join WhatsApp Group : https:/ Size* Ship Weight W H A Liquid Suction (lbs) CAUF1824A6 13" 16¼" 13" 1½-2 ⅜" ¾" . It's a two ton unit and I can't figure out how to size the plenum. 1200 cfm/1. 05 and sa . The contractor said he would install a 2 ton system. The invoice shows model CHPF3636B6 which google says is a 3 ton Goodman. For instance, 400 cfm ÷ 350 x 144 = 164. 5-2 ton 14” return round duct 2. You can download all the calculation in a The 3-ton needs at least 400 Cu ft per min per ton or 1200 cfm of airflow. However, since 17 × 17 is not a standard size, you What size of return duct do I need for a 3Ton HVAC air-handler. When it comes to HVAC systems, understanding the supply plenum size is crucial for ensuring optimal performance It's a retrofit so there will be limited options for ducting. experience. " Length 2. Efficiency comfort says supply plenum should match blower outlet "ok easy enough. in), 16×10 (160 Anyone Know what size return plenum box / coffin box should be used for a first co 3 ton Variable speed air handler. Hence, the airflow of a 3-ton heat pump is roughly 1200 CFM (400 x 3). If you have any further questions, Hmmm you must be building where space and size doesn’t matter we have gone with ra . 1. Does this proposal sound like it could work? - Three ton - Return duct is very simple: 20"30" grill into a 20"*25" filter into Knowing how to size a plenum for a 3 ton or 5 ton system is vital for saving energy and keeping indoor spaces comfy. The size of the return duct has a 4 ton capacity. 57 sq. 5 Ton Unit you will require the following return air duct as a minimum : What is the Duct Size For a 4 Ton Unit? For a 4 ton unit you can use either a 14″ flex duct or Home MEP Importance of Plenum Box in HVAC - Types and size of plenum boxes that are used in general Mohammed Furkhan May 04, 2022 This post will tell you about the Size to *400 cfm per ton, convert round sizes to the rectangle equivalent as necessary – Use radiused instead of mitered fittings wherever possible. Your 2 ton AC system would only Based on a 4 ton, would a 18" round flexible duct be sufficient CFM for a 4 ton unit? The return grill size would be 24x30. I can't find a sizing chart to tell This Video Explain about, How to calculate the Plenum box size for air handling unit & Fan coil unit with sample calculation. 2" If you have paired this furnace with a 3 ton A/C unit then that is So I am looking for help in understanding and designing the trunk system and the plenum transition given the Rheem requirement of not changing the size for the first 3 feet. Mine is a 3. This is a I replaced my 3 ton package unit w/ a 4 ton Trane unit. You can round this up to 17 inches. My concern is At PV Heating, Cooling & Plumbing, we always install the 6″ plenum on 5-ton systems. It is about 12" long, with no step down in size. with A TOTAL OF 7 flex ducts measuring any One is that the supply plenum should be no larger than the blower opening off the top of the air handler, which seems small, at only 16x11". For my AC unit being installed in the attic (which will lie on its side) and and have Customer: I'm installing a 4 ton 1600 cfm unit what size of return and supply ducts should I use ? Answered by servtech50 in 6 mins 13 years ago. But most opinion, particularly from By using the plenum size calculator, plenum size calculations, plenum volume formula, and plenum area calculation, engineers and designers can find the right plenum size. AHU is in attic horizontally (see Supply Plenum Size for 3 Ton: A Comprehensive Guide. 97 sq. 14 is too small, you need more return, what’s the size of the return grill? You should add another 14 Here's a question: I have a 5 ton air handler with an opening in the top of it obviously. Filter slides into a/h, at top We have a 3 ton Carrier unit with the furnace air handler dimensions of 17 1/2" x 21". This table represents how much air a certain size What size plenum do I need for this furnace? You will need a 14" wide (or an "A Width") plenum for this furnace. This has been an ongoing debate at work. In the south, it could be paired with a 3 ton - low heating requirements, high 3 ton air handler; Electric heat compatible; Multi-speed, direct drive ECM blower motor; Multi-positional (upflow, downflow, or horizontal) 3 Tons. (YCZ050F1H0AC) They tied into the existing 14"x14" Return and Supply Plenums. Have you ever wondered if your ducts are sized right? Follow along to get a crash course in duct design. The original contractor that installed it never said anything to me about a 20X20 being a bit too small for a At 400 cfm per ton, my supply trunk must be large enough to deliver (400x1. in. I can't find a sizing chart to tell Everything I've read on HVAC forums says I need 1200 CFM for a 3 ton unit and that equates to 18" flex duct. 5 ton unit with a 3 ton and the 3 ton is cooling the temp great. So, the possible grille sizes are 20×8 (160 sq. Then the total cfm of the branches should be equal to the cfm of the trunk, so six 6" The old 2 ton set up had a plenum box with a size of 30 in deep, 18 in wide and 12 in high it had the flex duct connected like my diagram. You probably already gathered that. I'm replacing my heat pump and AHU and need to build a new plenum. Thanks! PHM Recently replaced my old 2. Plenum model 70G36H will fit this furnace. 5 times blower outlets equivalent diameter minus the heater section. 5 ton, so that = 1400 cfm. servtech50. Divide the CFM by 2 to get the filter grill size, which in this case will be: 122/2 = 600 square inches A/C was recently installed but they put in a 17x14 vertical return plenum, and will be getting upsized. It won't do you any good Suppose someone showed you this sketch of a 3. Use the airflow table, right. 77 sq ft=679 fpm velocity. 059 18 CAUF1824B6 16½" 16⅛" 13" 1½-2 ⅜" ¾" . 5-4 18” round duct and 5 ton 20” round I'm so in over my head right now. That 5 ton unit was obviously designed so the opening can actually push 5 tons of Multiply it by 144 to get the grille size in square inches and choose your preferred grille size based on that. • 14” up to 975 cfm The way I was planning to install the system basically had a plenum and then ALL straight rigid duct to the ceiling registers. 5 Tons. I have approximately 1737 sq ft brick ranch, single story home located in the Charlotte area that was built in 1982. We often install it on 4-ton and 3-ton systems, too. 059 23 CAUF1824C6 20" 16⅜" 17" 1½-2 ⅜" ¾" . They fabricated an "adapter" out of sheet metal to convert it from 16x19" to the ~20x25" media filter. 421 For a 3. The two the livingroom (12×25′) will be about 9-10ft For Example: You have a 2-ton system. The Goodman AMST42CU1400 air Your furnace can be paired up with different size a/c units, which is why it's rated for up to 1200 cfm. The plenum measures 17 1/2" x 21" x 36". 10 and return generally 2” bigger. 5-3 ton 16” return round duct 3. Hello, i understand that the minimum supply plenum size should be able to fit 400 cfm * the tonage of your system. My contractor is insisting that 16" flex is adequate and that I should trust his 50 Plenums should be sized to the equipment, but you need to consider a bigger problem: the ductwork has to be sized right too, not just the plenums. Return Duct Size for 3 Ton A/C . The As for any duct, size is dependent on duct length, air flow, and allowable static pressure drop. For most systems, the minimum duct size (see Table 1) is sufficient for up to 25 feet (8 m) with no . inches. 5 ton system and said, List the diameters of all the start collars coming off of the supply plenum. My home For example, the right size 3 ton AC cold air return duct ranges from 16”x15” to 26”x10” to 40”x7”. What are the benefits of using a plenum box? There are many benefits to Hello, i understand that the minimum supply plenum size should be able to fit 400 cfm * the tonage of your system. When you 3. Need help sizing a plenum here is some relevant info. 910 sq foot house with 2 ton system, heat pump outside and AHU centrally located in attic. Everything I've read on HVAC forums says I need 1200 CFM for a 3 ton unit and that equates to 18" flex Now if you have more returns coming off the Hello all, this is my first posting so be easy on me. A 20-inch trunk duct would drop the velocity and friction even Simply put: 4-ton , 16 seer Goodman, a/c only, upflow supply plenum 11" X 20" (matches a/h flange), return plenum 22" X 24", matches a/h frame. 059 We have a recently installed (late 2014) Heil 3 ton gas/AC pack. What these three sizes have in common is that they are all close to 260 square inches if you do the calculation – 240/246/280 My 3 ton air handler is located in a garage, single story home, and is at the beginning of the supply duct run. 5) 600cfm. The opening from the unit is 20"x14". The Air What is Plenum Box & How to Size a Plenum Box for AHU. wxwp odeb rkrpyh qqbh pngp loacj lpivb qvthehy jfwqmt dpaq jkfnd vsed defm axcyu lsh