How large a blower do need to look for to add air under the grates in a 3x8 raised flue? Where to look for one? Amazon has a 465 cfm blower for about 100$. Looks small...
How large a blower do need to look for to add air under the grates in a 3x8 raised flue? Where to look for one? Amazon has a 465 cfm blower for about 100$. Looks small...
Blower size is based on stack size ...
Radius x 3.14 will give you square inch of area of stove pipe
Then mutiple the squared inches of pipe by 15cfm per square inches.
Example
8 inch pipe has a radius of 4 inches
4 x 3.14= 12.56 inches squared
12.56in x 15cfm per square inch =188cfm
15cfm per square inch is a good average to base your minimum blower size .
It's easier to throttle a blower back in cfm then it is to try and get more air after you install the wrong blower.
What size is your evaporator and pipe. I have a 2x4 evaporator with a 7 inch pipe I run a150cfm blower on a reostat and stack can hit 1200degrees if i wind it up.
Hope this helps !
2015 First yr 50 taps, Oiltank arch 2x4 Flat bottom pan, 12 gallons finished
2016 New 2x4 arch ,Patrick Phenuef 2x4 hybrid pan, 80 taps on mainlines 33 on jugs
2016 5200 iters of Sap. 31 Gallons finished Great Year!
2017 105 taps all on gravity and main lines (Feb 20)
MF135 tractor
Honda Foreman Atv
Homemade sap collector wagon with 400 liter tank
2 Stainless steel 1000 liter storage totes
Timber King log splitter
I just used a large oil gun on my 2.5x8. , it works great and it was Free. I had a piece of plastic that coverd roughly half the opening before I put my airtight front on because it would blow ash out between the two doors. I think stack Temps are all relative to how far beyond the flue pan you are measuring, and the diameter of your stack. I run mine about 900° but my stack is thermometer is 5 feet from the back of my flue pan and I have a 12" stack. Works great for me. Before I added the blower it ran about 450-500
Nate Hutchins
Nate & Kate's Maple
2022 1000 taps?
3x10 Intensofire
20x36 sugarhouse
CDL 600gph RO
A wife and 2 kids.
I took apart a microwave once that had a small blower in it. I use it to get my shop stove going.
I've got a 400cfm blower on my 2x4. I am very glad I oversized it. It's very easy to "choke" it down just by blocking an intake. And It's one less thing to worry about when I upgrade or add additional stack. Most of the season I ran it at about 1/2 volume. But certainly had time when it ran wide open. Just my opinion
Sent from my SM-N930V using Tapatalk
2015 - 18 taps 1 Gallons, Turkey pan
2016 - 85 taps 5 Gallons, 2x4 Smokey lake maple continuous flow flat pan
2017 - 130 Taps, 18 gallons, 2x4 Smokey Lake Maple continuous flow, 8'x12' sugarhouse.
2018 - (planning) 250 taps, 4x40 200GPH RO, 2x4 Smokey Lake Maple continuous flow.
Sent from my SM-N930V using Tapatalk
2015 - 18 taps 1 Gallons, Turkey pan
2016 - 85 taps 5 Gallons, 2x4 Smokey lake maple continuous flow flat pan
2017 - 130 Taps, 18 gallons, 2x4 Smokey Lake Maple continuous flow, 8'x12' sugarhouse.
2018 - (planning) 250 taps, 4x40 200GPH RO, 2x4 Smokey Lake Maple continuous flow.
[QUOTE=JeffB;311861]Blower size is based on stack size ...
Radius x 3.14 will give you square inch of area of stove pipe
Correction
Formula for area of a circle is πr²=A
It will throw off your calculations a bit if you don't square your radius
2014 - 19 taps on gravity, propane camp stove with just 3 gallon pot - made 6 gal
2015 - 130 taps on gravity, 2x4 flat pan on run-down arch - made 25 gal
2016 - 300 taps on gravity, 2x6 A&A metal shop raised flue evaporator - made 25 gal (missed 2 weeks of season and then had to dump 10 gal of syrup)
2017 - 275 taps on gravity - made 38 gal (again missed out on some runs)
2018 - 275 taps on gravity - made 52 gal
2019 - 275 gravity - homemade RO (2 4x40s)
This thread caught my eye. A couple years ago, I decided to add blower intake to my outdoor pit. I assessed sources and quickly realized commercial blowers were out of my price range. I went to a local appliance dealer who had blowers from microwave over-range hoods parted out from trade-ins on the shelf and was willing to sell them to me for $5.00 each. These blower motors are a squirrel-cage type design and they move a lot of air. I had to make a simple box to house blower, but boy do they make an ideal hi/low speed blast-furnace blower. Keeps my sap at a rolling boil. One word of advice - also ask them to throw in the capacitor module that is part of the blower circuit. Appliance dealers have al lot of these also since they are a common failure item. It is quite likely they stored that part also since it is mated with the blower motor. Circuit diagram is normally glued onto blower motor housing.
Hope this helps.
I got a Dayton 1TDT2 blower on Ebay for my 2x6. This thing is a TANK of a blower, what I did was cut a circular piece of sheet metal and basically created a damper to cover the inlet. If I need more CFM I will open the piece more or if I feel its blowing too hard I close it up a bit. I was looking for a picture of it but I cant find one right now. I would suspect for a 3x8 this blower would be ideal for you, its probably a bit over powered for my 2x6 but I can adjust as needed.
Using that calculation above it says I need just a 149cfm blower.....well the one I purchased does 549cfm LOL so im not sure if that's the right calculation or not, but it works for me.
Good luck!
Last edited by SmellsLikeSyrupNH; 01-12-2017 at 07:18 AM.
2022 4x40" RO, Welch 1397 Vac Pump, 3 Guzzler Pumps, Lapierre Releaser, 1100 taps
2021 Twin Baby Boys, Close to 650 taps
2020 Upgraded RO to 2 post and 7GBS Pump. 265 taps
2019 Smoky Lake 2x6 raised flue, Autodraw system, Maple Jet Filter Press, a beautiful new bride to be my sugaring partner :-)
2017 Expanded Sugar Shack, new 2x6 with float box, NEXTgen Maple RO, 250+ taps, still on sap sacks
2016 Sugar Shack, 2x6 evaporator, 160 taps, all on Sap Sacks
2014 110 taps
2013 35 taps