Table 2-3. List of materials for the primary filter unit

Item Quantity Description
1B 1 5-gal metal can or other metal container with minimum dimensions of 11.5-in. diameter and 13 in. tall.
2B 1 Circular metal plate; diameter equal to 1/2 in. smäller than inside diameter of Item IB; thickness of 1/8 in.
3B 3 3/8-in. bolts; 3 in. length with two nuts for each bolt.
4B 1 Rectangular metal plate; width equal to 1/4 in. smaller than inside diameter of Item 1B; height equal to 2.5 in. smaller than internal height of Item 1B; 1/8 in. thick.
5B 1 High-temperature hose, 3/8 to 5/8 in. diameter; length equal to circumference of Item 1B.
6B 1 Circular metal plate; diameter equal to outside diameter of Item 1B; thickness of 1/8 in.
7B 1 12-volt blower (automotive heater type); case and fan must be all metal.
8B 1 Metal extension pipe for blower outlet, including elbows and connections for vertical orientation; 1 ft. minimum length.
9B 1 Cap for Item 8B; plastic is acceptable.
10B 1 1.25-in. metal pipe, electrical conduit, automotive exhaust pipe, or other metal tubing; 2 ft minimum length.
11B 3 Metal latch for securely connecting Items 1B and 6B together. Such devices as suitcase or luggage catches, bail-type latches, window sash catches (with strike), or wing-nut latches are acceptable.
12B 1 High-temperature hose, 3/8 to 5/8 in. diameter; length equal to three times the height of Item 4B.
13B 1 Metal 1/2-in. pipe, threaded on one end; 8 in. length.
14B 1 Metal pipe cap for Item 13B.
[Fire tube dimensions] [Materials for carbureting unit]