Joints, TDC, Flanges & Connections

Actuator Mounting on Dampers

Actuator Mounting on Dampers

Airflow direction/damper position before flex not checked

Backside Riser Flange Hardware Cannot Be Reached

Before RTU sets on curb - what do I check?

Before fastening duct to equipment cabinet

Bending flex tighter than it wants to bend

Bending flex tighter than it wants to bend

Bird Screen on Outside Air Intakes

Boot/register not aligned with ceiling tile

Boot/register not aligned with ceiling tile

Canvas connector tears on startup

Collar before insulation jacket not sealed

Condensate Drain Slope and Trap

Condensate Drain Slope and Trap

Covering bad flex route because it is above ceiling

Covering bad flex route because it is above ceiling

Diffuser end after ceiling tile installed not checked

Do I put the butyl gasket tape on the inside or outside of the bolt holes on a TDC flange?

Drywall or framing crushes a flex duct run

Ductwork Gauge Markings

Ductwork in Assembly and Convention Spaces

Ductwork in Gyms and Fitness Centers

Ductwork in Hotels and Hospitality

Ductwork in Telecommunications Rooms

Ductwork in Theaters and Performance Spaces

Equipment is landing on curb and something looks wrong

Excess flex length stuffed above ceiling

Excess flex length stuffed above ceiling

Exhaust Discharge Orientation

Exhaust Discharge Orientation

Exhaust Fan Backdraft Damper

Exhaust Fan Backdraft Damper

Fan Inlet And Outlet Transition

Fan Inlet And Outlet Transition

Flex collar blocked by ceiling grid or framing

Flex crushed by other trade after install

Flex inner liner not pulled over collar fully

Flex inner liner not pulled over collar fully

Flex kinked around framing or pipe

Flex kinked around framing or pipe

Flex lying on sharp metal edge

Flex lying on sharp metal edge

Flex run too long for intended use

Flex run too long for intended use

Flex sagging between supports

Flex sagging between supports

Flex twisted and airflow restricted

Flex twisted and airflow restricted

Flexible Connector At Fan

Flexible Connector At Fan

How do I close a blind S-cleat joint in a tight chase when I can't reach the back?

How do I fix a piece of rectangular duct if it's knocked together out of square?

How do I install TDC/TDF corners without smashing them or bending the flange?

How do I tell the difference between a Pittsburgh seam and a snap-lock seam?

How far apart should the cleats be on a TDC/TDF transverse joint?

Inner liner pulled loose after diffuser is moved

Inner liner pulled loose after diffuser is moved

Inner liner torn during install

Inner liner torn during install

Installing a flex duct connection that is kinked at the elbow

Internal Tie Rods

Louver Free Area vs Face Area

Mixed insulated/uninsulated flex incorrectly

Mixing insulated/uninsulated flex incorrectly

Not checking airflow direction/damper position before f

Not checking diffuser end after ceiling tile installed

Not cutting flex to proper length before connecting

Not field-verifying that pre-punched TDC duct flanges align before ordering an entire duct package

Not giving straight section off collar before bend

Not giving straight section off collar before bend

Not pressing TDC (transverse duct connector) flanges down flush before assembly

Not sealing collar before insulation jacket

Not supporting flex at both ends

Not supporting flex at both ends

Not supporting flex near bend

Not supporting flex near bend

Outer jacket/vapor barrier cut and not repaired

Pool or natatorium equipment exposed to corrosive air

Reading Duct Gauge Off The Spec

S-Cleat and Drive Slide Direction

Seal Class A/B/C

Support spacing too wide

Support spacing too wide

TDC Corner Assembly

TDC/TDF Flanged Connections

TDF Flange Corner Gap

The shop sent the wrong fitting or elbow and the duct run is stopped

Transition from hard duct to flex not supported

Transition from hard duct to flex not supported

Tying New Duct To Existing

Using flex to solve a bad layout instead of fixing hard

Using flex to solve a bad layout instead of fixing hard duct

Using narrow strap that pinches flex

Using narrow strap that pinches flex

Using tape alone as mechanical connection

Using tape alone as mechanical connection

VAV Box Clearance Requirements

VAV Box Inlet and Outlet Orientation

Vibration Isolator Clearance

Vibration Isolator Clearance

What Pressure Class Means

What's the proper way to cross-brake a piece of flat metal in the field?

What's the trick to seating a stubborn Pittsburgh seam on a large rectangular fitting?

Which way does the "drive" face on a vertical drop?

Why does a shallow condensate trap make an AHU drain pan overflow?

Why is a hard elbow right at a VAV inlet a problem?

Why is it bad to neck down a VAV discharge immediately after the box?

Why is stretching butyl gasket tape a bad idea?

Why would a flexible fan connector balloon out and rip loose?

Wrong flex diameter for branch

Wrong flex diameter for branch

Zip tie/clamp on outer jacket instead of inner liner

Zip tie/clamp on outer jacket instead of inner liner