The Duro Dyne MFPT Compact Pinspotter was staple in duct shops throughout the USA for many decades. For smaller shops, it was their sole means of spotting weld pins to ductwork; for larger shops it was used on all lined fittings and the FG-1 Bulk Feed pinspotter was used on Straight Duct. The fact that […]
Duro Dyne MFPT vs MF70 Compact Pinspotters Read More »
In HVAC Ductwork, Pressure and Velocity are two standards around which Engineers design duct plans. Building duct to a Higher Pressure class however doesn’t improve the system’s performance in handling vibrations that accompany changes in Velocity. In Duct Fabrication, the familiar criteria on the checklist towards reaching an excellent Pressure Class performance include Duct Gauge
Controlling Vibration in Duct System with Flexible Duct Connectors Read More »
Is Painting Duct Wrap to Match the Ceiling a Thing of the Past? It’s commonly known that fiberglass duct wrap insulation comes standard with an FSK aluminum foil jacket. In fact, over 95% of commercial installations using duct wrap have an FSK jacket. As building design trends shift toward leaving ceilings exposed, this has created an
Fabric Duct has been around for over 30 years but has seen an surge in popularity over the last several years with increased awareness of its existence and its advantages over round metal duct on specific types of indoor low to medium pressure duct systems that have a relatively clean environment. Most common applications for
Most Fiberglass Pipe Insulation has a plain uncoated paper jacket. Because there are many hands coming in contact with these 3 ft pieces, the downside to such a jacket is a higher risk of popping a hole into it with a finger or work tool or spilling a dark liquid on it that absorbs into
Owens Corning Fiberglass Pipe Insulation Read More »
Square Framed Access Doors are most commonly the Dovetail Tabbed type with a Cam on either side or a Cam and Hinge on either side. They are often included in the Air Distribution package, included as a Lump sum amount. Increasingly, Mechanical contractors study every portion of the Job Site Processes in an effort to
Square Framed Access Doors: Dovetail Tabbed vs Press On Self Stick Read More »
The correct way to Order a Square Elbow: In fabrication of Square Elbows, there are four pieces: two Cheeks (which will end up being the sides of the elbow), one Throat, and one Heel. In the fabrication process everything starts with the Cheek. The first dimension of an Elbow is always the Cheek size; the
Rectangular Duct is hung with 1″ wide 22 gauge (or 20, or 18 gauge) Galvanized Strips that is supplied to the field along with the fabricated ductwork. 10 ft strips, cut and bundled, is the most common. (Some shops use 100 lb coils though any savings in “drop” are negated by the much higher cost of the
Hanging Rectangular Duct with 1″ wide Hanger Strap Read More »
The opening rolls are heat treated when manufactured so that they are not too hard (otherwise they would chip) and not too soft (otherwise they would easily wear out). Without it the pocket closes like this… And the male Pitts doesn’t seat easily… When you know that it’s time to replace the Opening Roll wheel
Opening Roll—Why it’s important Read More »
About 80% of projects that Conklin’s Plan & Spec Division bids have Linear Slot Diffusers (aka LSD’s) on them to some degree. Next time you’re in a relatively new or renovated Airport Terminal, Convention Center, Office Building or (sometimes) your neighborhood’s new Starbucks there’s a good chance you’ll see, in the ceiling, two or three parallel
Linear Slot Diffusers in the Air Distribution Package Read More »
You’ll often hear duct shops refer to “Small Pittsburgh” and “Large Pittsburgh” when they reference their fabrication processes. A duct shop may say for example, “we run Large Pitts on straight duct and Small Pittsburgh on fittings” yet, nowhere will you see this differentiation in SMACNA or by Engineers (in Job Specs). That’s because there’s
Pittsburgh Seam: Small vs Large Read More »
Now that Duro Dyne has redesigned the CCD110 and it looks just like a smaller version of the MF12, what are the differences? After all, they are used the same exact way and have the same (16 gauge) capacity. While Both machines are Single Phase electrics, the CCD-110 runs off 110 Volt (which means it
Duro Dyne Portable and Compact Pinspotters: MF12A vs CCD110 Read More »
Fastening ductwork like square to rounds and flex connections into an assembled fitting can be done with Drill Screws, Pop Rivets, an Acme Lock, a Spotwelder…or a Clinching Machine. While a spotweld’s burn marks don’t make for an aesthetically pleasing product, the products made in a duct shop typically don’t require it. One reality many shops are facing
Norlok Clinching Machines Read More »
The Trumpf F301 Seamcloser is an alternative to an Air Hammer in closing the Pittsburgh Seam into a Lock by means of rollforming it over instead of hammering it over. There are advantages to Closing the Pittsburgh by a Rollforming process rather than a Knocking Over process—a much quieter process and a cleaner looking Lockseam
Trumpf F301 and F300 Pittsburgh Seamcloser Read More »
HETOs in HVAC ductwork: In commercial jobs—whether they be hospitals, office buildings, schools, theatres, arenas or airports—there is a main Trunk line (also called the Loop Duct) that extends throughout the Duct design. It’s rectangular instead of round because it’s sized larger than the downstream duct coming off of it. Rectangular is more practical than round as it
HETOs — High Efficiency Takeoffs Read More »
Rectangular Ductwork is typically insulated internally with Duct Liner rather than externally with Duct Wrap because of the acoustical benefits. Most duct shops will have two pinspotters for use in securing the Duct Liner to the Metal ductwork: a free standing “FG” model with a 5 ft throat and a smaller “MF” model with a 12
FPP5 Bulk Feed Conversion Platform for Pinspotters Read More »
What is the difference between Hi-Temp Silicone “Red” and Firestop? Regular Silicone has a service temperature of -40 to 400F (multi-colors) (Boss 315 is an example). Hi Temp Silicone has a service temperature of -40 to 500F (red) (Boss 376 is an example). FireStop Silicone has a service temperature of -40 to 500F (red) (Boss
What is the difference between Hi-Temp Silicone “Red” and Firestop? Read More »
Roof Curb manufacturers use a lot of 1″ Duct Liner. They also use a lot of adhesive to adhere the liner to the metal and then a much higher than normal % of weld pins to secure the liner to the metal. Why so many weld pins? After all, In a typical HVAC Duct shop the usage
Every Curb Adapter Shop Has Duro Dyne PBF Pinspotters Read More »
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Protected: Flexible Duct Connector Read More »
What The Air Distribution Package is… Rectangular Duct on commercial jobs is also referred to as “Trunk Duct” or the “Loop Duct”. It’s typically where the volume of air is higher. When it begins branching off into various areas of the job, there’s a drop in the amount of air as the system disperses air along
Everything Coming Off of the Rectangular Duct Trunk Lines: The Air Distribution Package Read More »
Because of the name, there’s confusion between these two machines. While each machine turns a flange on the edge of metal, one works only on a flat piece of metal while the other works only on an already formed round pipe edge. Therefore when it comes to their function in a sheet metal shop, these
Power Flanger vs. Power Rotary Machine Read More »
When it comes to Single Wall Spiral Duct, contractors typically attach one piece to another on the job site with a Slip Coupling and screws. But, the larger the diameter the more of a challenge it is to use slip couplings…and the quality of connection is rarely good. As a rule of thumb, these contractors
RLS = Rapid Locking System Press Fittings are a solution for joining together tube without use of solder/flame for high pressure refrigerant applications RLS Press Fittings offer a simple, effective and economical method to create leak-free copper tube connections. Made of soft copper for easy crimping, RLS Press Fittings can connect to both soft copper
Installing fiberglass pipe insulation takes skill and patience. It can be especially time consuming when you need to create a customized fit around small bore pipes and fittings. Filleting insulation to fit small pipes and joints can be inefficient and labor intensive and a poorly placed fillet can result in wasted materials and be costly. That’s why Owens Corning has created an
Fiberglass Pipe Insulation Read More »
In TDC, TDF and Ductmate fittings there’s usually an open gap of remaining V Notch in between where the duct is joined with the corner. This gap needs to be sealed, otherwise it can become a point of leakage when TDC, TDF or Ductmate is used as the transverse joint connection. The Duct Shop is typically
Filling the gap caused by the V Notch on TDC and Ductmate Fittings Read More »
