Rectangular Duct & Fittings

A wide 45-degree rectangular elbow buckles or oil-cans

Backside Riser Flange Hardware Cannot Be Reached

Before putting mastic or tape on the joint

Bolt holes line up before lifting duct not checked

Bolts started in one corner only causing twisted flange

Burrs on the drive are catching the hem

Can you flip a wrong-hand 45-degree fitting instead of remaking it?

Can you save spiral pipe after the lockseam unzips?

Corner clips missing or loose on flanged duct

Cutting Ductmate rail too short

Duct gauge or reinforcement changes mid-run and I do not understand why

Ductmate/TDC connector matches duct size not checked

Ductwork Gauge Markings

Fabricating a round-to-rectangular transition that is too abrupt, causing turbulence

Find TDC corner leaks during a pressure test

Flange corners after assembly not sealed

Flange damaged during material handling

Flange damaged during material handling

Flange face for dirt/oil before gasket not checked

Flange joint with unsupported duct weight hanging on it

Flanged duct where access for assembly is impossible

Forgetting to add allowance for the slip and drive connection when cutting duct

Forgetting to install turning vanes in a square duct elbow

Gasket displaced while lifting duct into place

Gasket from rain/dust before install not protected

Hammering a pittsburg seam without properly supporting the duct body

How do I avoid the single-blade crimp slip-out?

How do I avoid the sliding notch lock-seamer slip?

How do I know if S-and-drive is allowed for this duct?

How do I use drift pins and C-clamps on TDC/Ductmate alignment?

I cannot drive the back S-cleat on a blind duct drop

I find a bad s-and-drive joint above ceiling

I forgot to fold or tab the drive ends

I forgot to fold or tab the drive ends

I over-screwed or distorted the joint

Installing flange joint with unsupported duct weight hanging on it

Installing gasket on dirty flange face

Internal Tie Rods

Leaving bolt heads/screws interfering with insulation

Leaving bolt heads/screws interfering with insulation

Leaving cut sheet metal scraps on the floor creating a slip and puncture hazard

Mis-rolling a spiral elbow segment so the seam is in the wrong position

Missing cleat on long side of flange

Missing gasket or installing gasket with gaps

Missing gasket overlap at corner

Not aligning the drive cleats correctly before crimping, creating gaps

Not cleaning the rolls on a slip roll machine, causing marks on finished duct

Not installing a turning vane in the correct orientation relative to airflow direction

Not screwing the joint where detail or spec requires it

One duct section is S-and-drive and the next is TDC/Ductmate/flanged

One duct section is out of square

Over-tightening and crushing gasket unevenly

Produce-Mister Humidity Is Causing Nearby Duct Sweating

Reading Duct Gauge Off The Spec

Room to get tools on flange bolts not left

Running the seam in the wrong direction, trapping water or allowing leakage

S-Cleat and Drive Slide Direction

Seal Class A/B/C

Sealing flange corners after assembly

Snips are mangling the connector

TDC Corner Assembly

TDC flanges before bolting not aligned

TDC gasket keeps falling out during lift

TDC/TDF Flanged Connections

TDF Flange Corner Gap

The S-and-drive cleat will not seat or keeps stopping halfway

The S-and-drive joint will not line up

The S-cleat is bent open or crushed

The S-cleat side is not fully seated

The drive cleat is going on crooked

The drive is only partly seated

The drive misses the corner or S-lock area

The duct weight is pulling the S-and-drive joint open

The joint is dusty, oily, or wet before sealing

The rectangular duct end looks upside down or rotated

The short-side/long-side connector pattern looks wrong

The two duct sections will not pull together

There is a gap at the S-lock corner

Tying New Duct To Existing

Using damaged Ductmate corner piece

Using flanged duct where access for assembly is impossible

What Pressure Class Means

What do I do about screw penetrations near an S-and-drive joint?

What do I do before connecting a section that might be facing the wrong way?

What do I do before insulating or covering an S-and-drive joint?

What do I do before putting mastic or tape on the joint?

What do I do before starting a drive cleat?

What do I do if I think this duct should be TDC/Ductmate instead of S-and-drive?

What do I do if forcing the joint oil-cans the duct?

What do I do if the cross-break looks wrong?

What do I do if the drive cleat is cut too short?

What do I do if the drive cleat is too short or too long?

What do I do if the joint is dusty, oily, or wet before sealing?

What should I check after the S-and-drive joint is installed?

What sides get S-cleats and what sides get drive cleats?

Why do turning vanes have to face the incoming airflow correctly?

Why is a flat-on-one-side 45-degree transition choking airflow?

Why is the wide side of a 45-degree duct elbow buckling?

Why should screws stay off the spiral lockseam?

Wrong bolt spacing or missing clamps on long flange

Wrong fasteners for flange/corner