Duct Size Per Ton PDF
per ton and this will give you the total BTU rating. 3.5 x 12000 = 42000 Multiply 6 x 42 to determine the duct size of 252 square inches The clear are of the duct must be at least
Size for *400 cfm per ton, convert round sizes to their rectangle equivalent as necessary. ... to size flexible duct. – *Assume 75 cfm per 6” flex branch with a 4x10 floor or a 6x10 ceiling register. Example; a 2 ton system should have 10 or 11 outlets.
air flow per ton of cooling and raises the evaporator coil temperature, usually increasing the rated efficiency. For systems with a fixed metering device ... Set the duct size schedule for supply runouts to 4” through 8” ducts in one inch
Then a 6 ton unit would give an ... duct size, air flow in cubic foot per minute and flow velocity. Reference 2 indicates that duct velocities should be about 900 ft/min or less. Entering an air friction chart at 2137 ft3 /min flow
generally will back out to a local rule of thumb for square footage per ton (in my area it is 600 square ... He did this on every new plan and never changed the size of the equipment to meet the ... and tested for house and duct leakage by an independent 3rd party! The production ...
Because of the small duct size of SDHV systems, air velocity is much greater than with ... Also extending the range in either direction could cause the CFM per rated-ton of the SDHV system to drift outside the mandated limits of 220 to 350 CFM per rated ton. 22
FPM- velocity/speed of airflow; feet per minute AREA- duct size in square feet CFM = FPM X AREA ... 700 per ton low installed cost $ 2,500 - 3,500 per ton high operating cost high maintenance/repair cost as units get older appx 12 - 15 year useful life
Size to *400 cfm per ton, convert round sizes to the rectangle equivalent as necessary ... to size flex duct. – *Assume 75 cfm per 6” flex branch run with a 6” x 10” ceiling register. Example; a 2 ton system should have 10 or more branch runs.
air flow per ton of cooling and raises the evaporator coil temperature, usually increasing the rated efficiency. ... size and duct layout based on actual orientations for each house, although that would be ideal. It
Minimum Duct Size Model Part No. Diameter Length 1218 UPC-04-1218 12 in. (305 mm) 10 ft. (3 m) 2430 UPC-04-2430 14 in. (356 mm) 3642 UPC-04 ... CFM/nominal ton (33 l/s per-kW). Thermal Performance If the duct system is installed in an unconditioned area,
• 1 ton of cooling= 12,000 btu/hour ... and Component Sizing • CFM - volume of airflow; cubic feet/minute • FPM - velocity/speed of airflow; feet/minute • AREA - duct size in square feet CFM = FPM X AREA FPM = CFM /AREA AREA ... 40 ft2 per person density) • CO2 sensor controls ...
RIGHT-SIZE HEATING AND COOLING EQUIPMENT The correct size improves comfort and reduces ... the blower and often exhibit more duct leakage due to higher operating duct ... or 400 to 500 cubic feet per minute per ton of cooling capacity. • Heat pumps also require the proper thermostat type to ...
combined with the size of the duct. Naturally the larger the duct is and the more pressure behind the air, the more air that can be moved. Normally you would expect to have a total air volume of approximately 400 CFM per ton of air conditioning moving through the air handler and duct system.
coils averaging 322 CFM per ton of cooling capacity.” “The split system air conditioner evaporators drew an average 650 watts per 1000 CFM of airflow.” “Only 28% of the systems tested met the 2008 California Title 24 Standards for cooling airflow and ... Duct Size (inches ...
Square ft. of Room Area: 1,975 Square ft. Per Ton: 1,148 Volume (ft³) of Cond. Space: 17,763 Building Loads ... Runout Duct Size: 9 in. Actual Summer Vent.: 0 CFM Runout Air Velocity: 464 ft./min. Percent of Supply: 0 %
(the 1970’s) required about 1 ton per 400 to 500 square feet • Homes designed toHomes designed to “better thanbetter than ... th t i th d t t hi “ lfthen to size the duct to achieve a “self-bl i ”balancing” system
determine the proper size needed for your home. Bigger is not better. Over sizing causes the heat pump to start and ... CFM per ton. An ideal duct system has both a supply register and a return register for every room. Most homes, however, have
When Trunk Dampering static pressures in open supply duct will increase at a higher rate ( use 400 cfm/ton for total in step #1) When bypassing over 2100 cfm, use two bypass ducts ... you might need a bypass duct (3) Size Bypass per chart below
It uses a fan to push air through a duct system where it is conditioned, ... Manual J to size your unit. When contractors use rule of thumb the unit is ... Mini-split systems are around 1,500–$2,000 per ton, which is about 30% higher than a forced air system (before the price of the ...
• At 400 CFM per ton, older homes (the 1970’s) required ... Goal are between 1500 and 2000 sf/ton Duct and Register Design Strategies. System Characteristics System size sf/ton Air flow cfm/sf Air exchange rate ACH Historic Standard Base House, Austin TX 400 480 1 cool.82 cool 7.5 5.5
PER TON, and furnaces at 12 CFM/1000Btu. In general, ... (measured in cubic feet per minute, or cfm) to the living area through the duct system, ... Figure 28-32. Measure carefully, then use snips to cut duct pieces to size. 28.10.2 Cutting Openings To begin branch pipe runs, openings must be cut in
TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) ... SPECIFIC HUMIDITY = grains of moisture per dry air 7000 GRAINS in 1 lb. of water DEW POINT = when wet bulb equals dry bulb ... CALCULATING OIL NOZZLE SIZE (GPH): _BTU Input___ = Nozzle Size (GPH) 140,000 BTU’s OR
tHe size of outlets oN sHeet metAl duCts. ... you’ll have six to eight outlets per nominal ton of cooling. PerfeCt for for reNoVAtioNs ANd retrofits ... Small duct high velocity air handlers are increasingly popular because of the flexibility
with the optimum unit size in the 40 to 60 ton range. Central system costs follow a similar trend, with costs per square ... can still add as much as $0.75 per sq ft. For example, duct distribution costs can be greatly increased if the mechanical room is located between
Size will be accurate only to the nearest five(5) tons. ... ton and $1500 per ton, pricing a job is easy. A 2500 sf house gets five (5) tons ... A duct blaster is used to insure that duct leakage measured in Cubic Feet per Minute (CFM) is less than 3 percent of the floor area.
400-600 sq. ft. floor area per ton 400 sq. ft. of floor area per ton 20 people per ton Office Building Large Interior Large Exterior Small Suite ... Branch Duct Size Avg. CFM @ Static Pressure Duct Cross-section 4” Round 30 CFM 12.57 Sq-in
If the minimum tons for a 30-ton circuit are reported ... size. The equal-friction-duct sizing methodology attempts to keep the pressure drop, per unit length of duct, relatively constant throughout the system. It is widely used to
• Other per customer specs AAON RM-A000-SB-073-14,18,24,36 A Box (2 - 7 Ton) ... 7 Ton) w/ Duct Rails 1028 Opelika Road, Auburn, AL 36830 Ph: (334) 826-9538 Fax: (334) 826-9539 13 3/4 ... • Height determined by duct size
• At 400 CFM per ton, older homes (1970s) required about 1 ton per 400 to 500 ft2. • Homes designed to “better than ... evaluate the friction rate at each duct run and then to size the duct to achieve a “self-balancing” system.
return duct The HVAC contractor ... builder should be aware of the location and size of the return duct, which is typically installed prior to any sheetrock. A return should be sized so that the area of the filter grill is from 1 1/2 to 2 square feet per ton of cooling. 74
25 ton vertical models and 30/60 ton ductable models. ... Condenser rows/fins per in. 4/14 4/12 4/22 3/15 2/14 ... Duct size, mm (in.) — 508 (20) w/clamp Overall dimensions, H x W x D, mm (in.) (dimensions do not include ducting or plenum
with 3 Ton Drive Furnace 75 MBH out with 4 Ton Drive Furnace 95 MBH out with 3.5 Ton Drive ... If you reduce the return air duct size, then you reduce the supply side air flow. ... The maximum sag allowed by the ADC is ½” per foot of length (2 ½” in a 5’ span). But what if I have compression
ber of trunk-duct size reductions and changes of direct ion Consider use of nonstandard duct sizes for ... square feet per ton cooling). the builder performed a quick estimate on this new house type to verify park,” as follows—
size duct.The loop is fed by four or more ducts radiating out from the central plenum. They are usually the same size as the loop duct. ... sider a 3-ton system that requires 450 cfm per ton for cooling (1,350 cfm). Assume that the return is
Seal it, duct it and secure it ... enough for the size of the system. A good rule-of-thumb is 1 1/2 to 2 square feet per ton of cooling. 76 Tighter ducts. A supply boot is caulked to the floor to reduce leakage. A home-made return air "duct."
horsepower-per-ton by 6 to 10 percent, depending on compressor type. ... Insulate all ductwork and specify insulated duct hangers. Air Handling Units 1. Size the cooling coil at velocities of 500 FPM or lower. Higher velocities shall cause
Duct Free Single Zone Systems, One Ton Indoor Components W1 Surface Mount Wall Unit Fujitsu Halcyon ASU9RL. 7-day programmable thermostat. ... The duct within the roof / attic shall be insulated flex duct, size per HVAC plans.
foot home with a 2 ½ ton HVAC unit. Most homes of the same size are having multiple units with 6 tons or more ... Rules of thumb are used such as 500 square feet per ton and $1500 per ton. ... improperly designed duct systems contribute to high energy costs and comfort issues.
This is due to the assumption that air handlers typically circulate about 400 cfm for each ton of capacity. ... The recommended velocity is 1000 fpm as per Table 4.1. from Figure 4.3, the duct size is approximately 18".
System size sf/ton Air flow cfm/sf Air exchange rate ACH Historic Standard Base House, Austin TX 400 480 ... systems based on the 400 cfm per ton energy balance of current DX systems In the future we’ll need to: ... For shorter duct runs, the strategy should locate
PLEASE PRINT SIZE/ TONNAGE/ ... residential-Minimum $ 40.00 per unit Duct System Only, commercial-Minimum $ 40.00 per unit plus $ 2.00 per outlet ... Chiller Replacement-$ 40.00 each plus $ 2.00 per ton
SMALL DUCT HIGH VELOCITY: Duct Layout. Bulletin 100-135 / August 2010 ... 7 two inch outlets Per Ton / 5 two and a half inch outlets Per Ton (3.5 kW). For refrigerant cooling applications the ... Size and trap per their
Contractor A is $1,000 per point ($6,000 ÷ 6 pts = $1,000 per point), ... brick or siding, etc.), building size, etc. Heating and cooling needs are expressed in British ... Ton (of air conditioning): ...
which may increase the system size by 1 ton when the ACCA Manual S procedures are applied. ... and duct design to deliver conditioned air to the rooms of the house, ... come closer to the industry standard sizing of 400 square feet per ton. Table 2. Baseline Calculated Loads Using ACCA MJ8
heat gain calculation per ACCA Manual J or the ASHRAE Handbook of ... Duct size should be determined by: a) The supply air requirements of each room. b) The available static pressure of the blower. c) The total equivalent length of the various duct runs, duct fittings and terminal devices.
One ton is equal to 12,000 BTU. Terminology Save $95** per year Save $60** per year Save $30** per year annual heat pump savings ** compared to using electric strip heating in a 1,500-square-foot home. your actual ... electrical or duct system and ask if duct size is appropriate for
Unit 1 operating cost: $ per year – Unit ... Annual cooling cost to run a 3-ton (36,000 BTU/Hour) installed in the 1990s with a 10 SEER will be $1,070. ... home’s electrical or duct system and ask if duct size is appropriate for your new system
In this method the frictional pressure drop per unit length in the main and ... the duct size may increase in the airflow direction. Also the velocity at the exit of the longer duct runs may become too small for proper air distribution in the
Other per customer specs AAON RN-A000-SB-074-14,18,24,36 A Box (6 - 10 Ton) ... 10 Ton) w/ Duct Rails 8737 AL Hwy 51 Opelika, AL 36804 Ph: (334) 826-9538 Fax: (334) 826-9539 26 14 1/4 74 3/4 ID ... • Height determined by duct size
Duct Leaks Duct Heat Gains ... moved to 450 CFM per ton (some latent capacity is lost). *On the flip side, the system loses 7% in sensible capacity ... Calculating proper system size or making promises regarding energy savings is impossible