Rectangular Connections

 
METU Profile with corner piece
METU Profiles

Profiles

METU M2-A-Corner Piece

Corners

Photo of an installed METU G-Clamp

Clamps

The METU 4-bolt connection system (patent) was one of METU's main innovations which rapidly became a worldwide industry standard. Our profiles and corner pieces are still considered today to be one of the sturdiest in the market. Four main criteria determine the performance of the air-ducts:

Leaks

Any leaks increase the energy consumption, the generation of noises
and influence negatively the air-quality.

Air-tight Ductwork


The METU solution: a prominent edge in the corner area (1)
and a metal to metal sealing-lip (2)

Weak Profiles

The profile deflection influences the the efficiency and integrity of the system,
its applications range and the appearance of the installation.

Criteria for defection of rectangular ducts


The METU Solution: a hollow triangular profile (3)

Weak Corner Pieces

The corner piece strength influences the air-tightness of the assembly, the required number of clamps and the required number of supports.

Angle stability criterion on rectangular ducts


The METU Solution: deeply press-formed corners (4) and the support leg of the profile (5)

Torsional Strength

A gap between the profiles influences the air-tightness of the connections,
the appearance of the installation and the required number of clamps.

Torsion criteria for rectangular duct profiles


The METU Solution: the supporting leg (5) offers a important resistance against torsion.

 

Mr. Manfred Meinig

Mr. Manfred Meinig, inventor of the 4-bolts system

Patented innovation to connect rectangular ducts which became an industry standard

Original 4-Bolts METU Patent dated 1969

METU Rectangular Duct Connection