Triangulation - Transition with 3 sides slanted, fabrication

#ductwork #hvac #sheetmetal #ventilation #triangulation

[@NineGaugeNut]

You've successfully overcomplicated this process for anyone attempting to do it in the field.

[@sheetmetalwork]

Sorry Bryan! I agree with you that this can and is a complicated process. 95% of the time this isn’t a fitting that’s built in the field, UNLESS a person can use his layout knowledge to fabricate it on site. The main reason is, there are No Shears, no lock formers or Bending brakes ON SITE. Yes you can use S cleats, screws and hand benders 👍 WHEN THER’S A WILL THERE’S A WAY.

[@dannyvanoni5310]

That’s what I use on site.. I’m about to core core 6 holes on a Sunday for some dryer and bath exhausts.. good day fellas

[@marconantel7735]

Great video Duane, thank you

[@sheetmetalwork]

Your welcome,

[@JahidHasan-hm9yb]

Excellent sir

[@sheetmetalwork]

Thank you Jahid.

[@roymegallon8834]

Nice idea....

[@sheetmetalwork]

Thank you

[@leftymariano1020]

so to sum up my question wouldn't the cut size be 12? 6 inches for the long side slope plus the 5 inch duct opening plus the to half inch snap lock bends? that way u have 6 inches to the botton and on the other side wen u come over 8 from the bottom plus the half inch u would have 3 inches left over for the short side slope? I hope my question makes sense

[@user-de8fi2ih3s]

Mr. Duane any chance you can show how to make a return plenum for a ducted split that has an opening of 39x10 and on that return plenum there has to be a filter 25x16 if you have time please...

[@leftymariano1020]

hey duane, I watched this again and im a little confused. I understand how u get the length of the piece, but for the top cheek u cut it at 11 inches, and the width was 5 at the top. so if u come over 5 inches over from ur half inch scribe line for ur male, u will have 5.5 left over. so that wound mean to the bottom of the duct u would have 5.5 inches. if the long side slopes up 6 inches, wouldn't that mean ur a half inch too short?

[@sheetmetalwork]

OMG! If you’re confused, it’s my fault. SOOOOO SORRY! I just checked out the video and I see that I wrote 11 inches for both cheeks and it should have read 12”. My Bad and I wish I could make the edit as we speak, but not sure if I can. At least I did cut them at 12” in the shear

[@sheetmetalwork]

Ooops! I hit send too soon. Thanks for the correction and if you look hard enough you may find more? But I hope not 😀

[@elloko7644]

Whats the formula for an offset up and over .... I'd really appreciate that information tinner!! 🤑

[@elloko7644]

Same size(both sides) ductwork (rectangular)

[@sheetmetalwork]

Are you talking about an offset using two identical elbows, or simply metering the duct

[@sheetmetalwork]

I meant mitering

[@sheetmetalwork]

I put out a video that explains field on site offsets kzbin.info/www/bejne/pn6yammcjNOcj9U

[@JahidHasan-hm9yb]

Sir, this one system four side slopes

[@sheetmetalwork]

Hello Jahid, kzbin.info/www/bejne/iXuTgHWulrVrlaM

[@yanilopez9643]

Can you please give me the formula, I love your videos

[@sheetmetalwork]

Hi Yani, what formula

[@onemischiefmaker7032]

we are not understanding the numbers you are coming up with for the slopes and wish you would have videoed the complete math process.

[@sheetmetalwork]

@@onemischiefmaker7032 I’m sorry I wasn’t able to make it clear, Trust me, I wish I could snap my fingers and produce another video but I just don’t have the time at the moment. The only thing I can say at the moment is that this fitting requires knowledge of triangulation layout. Perhaps if you watch my other related videos as I do with my students. The first video from my channel that I would recommend is Sheet Metal Pyramid for an introduction to Triangulation, the second video is Sheet Metal transition with 2 slopes and the third is Sheet Metal Transition with 4 sides sloping. I wish I was there to help you.

[@sheetmetalwork]

Transitions simply use the Pythagorean theorem C= Sq root of (A sq + B sq ) To solve a slanted side length, you first need to know how long the fitting needs to be, also called finished length. The second measurement required is the amount of change or slope. Here is a Pythagorean scenario for you, If a building is 20 feet tall and let’s say you have an extension ladder that is 6 feet away from the base of the building. the ladder length required will be 20.88ft to reach the top.

[@sheetmetalwork]

@@onemischiefmaker7032 if you have a few minutes you could look at this video, it may help?

[@leftymariano1020]

@Duane Maillet this is Stephen Paoli by the way this is my new youtube account lol

[@sheetmetalwork]

Great to hear from you Lefty Stephen. LOL 😂

[@aarongonzalez3448]

why did you add 2 inches to your top side when the calculator said 14.13

[@sheetmetalwork]

When working with S and D, tapering fittings use a 1” working line. That means this fitting is calculated using a working length of 13”.then you add 2” at the end and the fitting will finish 14”. I know it sounds complicated

[@aarongonzalez3448]

okay so im trying to make a transition piece from an air handler to existing duct work with one flat side which is the back of the unit. does the same formula apply or are there different formulas? or would you like to know the dimensions

[@aarongonzalez3448]

that formula definitely works for the right side and left side of my piece but for the front side it’s doesn’t seem like it does because the two measurements i get from the pieces are not the same, so i don’t know what side i choose or if there’s a different formula for it

[@Alauddin-fy6xe]

Nine ❤❤❤❤❤

[@sheetmetalwork]

@@Alauddin-fy6xe thanks

[@leftymariano1020]

Hey duane, i remember 2 years ago i noticed ur cut size was a half inch too short for the top cheek the 6 inch slope plus 5 inch width plus 1 inch for the two half inch bends which is 12. My question is since the bottom is flat, would the cut size still be 12? Or would it only be 11 since theres 0 slope. 12 right? Since its 6 inches off the ground

[@sheetmetalwork]

Hi Lefty, I’m not exactly sure that if we are on the same page regarding the top and bottom pieces for this fitting. To answer your question for the bottom cheek the cut size would be 15 x 12. I had previously made a comment back to you earlier that I had made a mistake on my cut size sheet. I wrote down 11 instead of 12. If you’re interested, I uploaded a video last week that explains flat on top and flat on bottom fittings. I’m happy to hear that you’re still active in the trade.

[@sheetmetalwork]

kzbin.info/www/bejne/iZzRmoN3osp2gsk

[@sheetmetalwork]

kzbin.info/www/bejne/iZzRmoN3osp2gsk