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8.1 Damper and Damper Actuator Unit Pricing - as of 94/06/29
Description Damper Install Total Damper(rectangular) opposed or parallel 1 to 5 SF $150 $100 $250 6 to 10 SF $260 $125 $385 11 to 15 SF $300 $150 $450 16 to 20 SF $320 $200 $520
Damper (round) 6" diameter $60 $50 $110 8" diameter $65 $50 $115 10" diameter $70 $50 $120
Point Description Torque Max sq ft Cost Type Capacity of damper DA1/A Modulating no 50 11 $132 DA1/B spring return 90 24 $180 DA1/C 130 35 $200
DA2/B Modulating with 90 24 $250
spring return
DA3/A Two position 50 11 $90 DA3/B no spring return 90 24 $115 DA3/C 130 35 $160
General Damper and Actuator Notes
Modulating actuators are based on either spring return or non spring return 0-10 VDC actuators. Non spring actuators cost less and they are able to provide more torque to drive larger dampers (sq ft2 versus 24 ft2). The main purpose of the spring is to return the damper to a fail safe position. A fail safe position can also be achieved by connecting the damper supply and CCS power supply to emergency power and drive damper to the required position on detection of power loss. The power requirements are relatively low. The non spring concept may make sense on a larger project with multiple actuators that already have an emergency power supply.
If dampers are located in close proximity one actuator can be used to drive several dampers with interconnecting linkage. Eg the following mixed air system:
2'X3' fresh air damper; 1'X3' return air damper; 2'X3' exhaust air damper 6 ft2 3 ft2 6 ft2 15 ft2 Damper $260 $150 $260 Install $125 $100 $125 Total $385 $250 $385 $1,020 Plus 24 ft2 spring return actuator $ 250 Plus CCS panel cost for one analog output $ 75 $1,345 $1,345 X 1.32 = $1,775 (control contractor mark up & overhead) $1,775 X 1.10 = $1,953 (mechanical contractor mark up and overhead) $1,953 X 1.10 = $2,148 (general contractor mark up and overhead)
Damper Pricing Notes
The above data has been interpreted from several suppliers' pricing data. Dampers consist of five major components; frame, blades, linkages, bearings and seals. The quality of all the components can vary greatly. The blade can go all the way from a simple piece of sheetmetal to sophisticated air foils which encase the damper seals. Two other general categories are rectangular and circular. Generally circular dampers are less expensive. Rectangular dampers divide into two further subsets; parallel and opposed blade. The above ballpark prices are based on a standard control type damper with seals, metal jams, bearings, parallel or opposed rectangular. Most suppliers price dampers in a matrix of height and width but we have reduced to four square foot categories for simplification. For damper areas larger than those listed use multiples of the listed dampers.
General Pricing Notes
Estimated costs are based on a sampling of damper costs complete with actuators, in the lower BC Mainland and south Vancouver Island. Assumed costs are control contractor costs and do not include mechanical or general contract mark up. Prices should be adjusted for any other conditions and profit. Labour has been estimated at $50/hr using hours from HVAC Systems Estimating Manual, by KHASHAB. The manual suggests the following mark ups: job overhead 3-10%; estimating contingency 0-10%; market contingency 0-5%; escalation 0.5-0.75%/mth; general overhead 1-3%; profit 10%; contractor mark up 10%; plus taxes.
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