D670, D675 and D680 Single Blade Round Dampers. CSI 3-Part Specifications.

General

The D670, D675, and D680 Single-Blade, Round Dampers ("Dampers") are designed for use in conventional air handling systems to control airflow in round ducts. The D670 Damper is constructed of galvanized steel; the D675 Damper, of aluminum; and the D680 Damper, of stainless steel.

Features

• Specially designed for round ducts 4 to 48 inches (102 to 1219 millimeters) in diameter
• Neoprene seals for tight closing and minimum leakage
• Oilite bearings for long life
• 90-degree damper travel for a variety of applications
• Pneumatic actuator mounting bracket provided

Description

The D670, D675, and D680 Single-Blade Round Dampers ("Dampers") are designed for use in conventional air handling systems to control airflow in round ducts. The D670 Damper is constructed of galvanized steel; the D675 Damper, of aluminum; and the D680 Damper, of stainless steel.

Specifications

Models:
D670 Galvanized Steel Damper
D675 Aluminum Damper
D680 Stainless Steel Damper

Size Range:
4 to 48 in. (102 to 1219 mm) O.D.
NOTE: Because of frame construction, 1/8 in. (3 mm) is deducted from ordered size unless otherwise specified.

Maximum Approach Velocity:
2000 ft/min (10 m/s)

Maximum Differential Pressure:
4 in. wc

Damper Travel:
90 degrees

Construction:
Frame:
   D670 Damper: 16-gage galvanized steel
   D675 Damper: 0.080-in. (2 mm) aluminum, mill finish
   D680 Damper: 16-gage stainless steel, 304 2B finish
   Sleeve and actuator mounting bracket dimensions in inches (millimeters):

Blade:
   D670 Damper: 16-gage galvanized steel
   D675 Damper: 0.080 in. aluminum, mill finish
   D680 Damper: 16-gage stainless steel
   NOTE: All models above 20 in. (508 mm) in diameter have a reinforced blade
Shaft:
   1/2-in. (13-mm) diameter
   D670 Damper: Cadmium-plated steel
   D675 Damper: Aluminum, mill finish
   D680 Damper: Stainless steel, 304 2B finish
Bearings: Flanged bronze oilite
Seals: On frame, closed-cell neoprene, 1/4-in. (6-mm) thick
Axle:
   6 in. (153 mm) long x 1/2-in. (13-mm) diameter
   D670 Damper: Cadmium-plated steel
   D675 Damper: Aluminum
   D680 Damper: Stainless steel

Temperature Range:
Seals rated for -35° to 180°F (-37° to 82°C)

Actuator Mounting:
Mounting bracket provided for mounting MP909E, H, and MP918A, B Pneumatic Damper Actuators

Pressure Drop:
Based on Air Movement and Control Association, Inc.
(AMCA) Standard 500-75 using test set-up Figure 5.5:
   D675, 12-in. (305-mm) diameter, 0.096 in. wc at 589 scfm
   D675, 24-in. (610-mm) diameter, 0. 100 in. wc at 2366 scfm

Leakage Characteristics:
Based on AMCA Standard 500-75 using test set-up Figure 5.5:
   D675, 12-in. (305-mm) diameter, 4.3 cfm at 1 in. wc
   D675, 24-in. (610-mm) diameter, 43.1 cfm at 1 in. wc
Refer to the following leakage multiplier chart for leakage at pressures other than 1 in. wc:

EXAMPLE:
Leakage for 12-in. (305-mm) diameter Damper at 4 in. wc (2.00 x 4.3) = 8.6 cfm

Shipping Weight:
Multiply Damper circumference (diameter x 3.141) by a multiplier according to the following table:

EXAMPLE 1:
Calculate the weight in pounds of a 12-in. diameter D670 Damper:
   1. Find circumference:
     12 in. x 3.141 = 37.7 in. circumference
   2. Multiply circumference by pounds multiplier (from table):
     37.7 x 0.5 = 18.9 lb

EXAMPLE 2:
Calculate the weight in kilograms of a 406-mm diameter D675 Damper:
   1. Find circumference:
     406 rum x 3.141 = 1275 rum circumference
   2. Multiply circumference by kilograms multiplier (from table):
     1275 x 0.005 = 6.38 kg