In this duct connection system, the upper and lower part of the duct section must be completely smooth so that the "Zeta" can be installed, since through one of its slots between the flange of a duct and through the other slot between the other flange of the other duct and the side section of each duct. They must have a small tab bent outward in the shape of a "C" so that the "Clamp" can slide and press one duct against the other.

1. Zeta:

a. The minimum caliber of the manufacturing is 24.

b. When used on all 4 sides, secure 2” from corners.

c. They are used up to a maximum working pressure of 2”

2. Staple:

a. The minimum manufacturing caliber is 24.

b. For working pressures of 3” its maximum length should be 36”.

c. For 4" working pressures, its maximum length should be 30".

d. They are not allowed for working pressures greater than 4”.