Brand New Damper Design - "The Macro Damper" - For Large Pits

SteveCK

TVWBB Pro
Howdy all. I have a new damper design for everyone. It's called the MacroDamper.

The MicroDamper has been successful on pits all the way up to UDS and large cabinet smokers (similar in size to the Backwoods Cabinet Smokers). But this leaves a gap for those with larger pits. The MacroDamper was designed for these people.

The MacroDamper was designed to utilize 80mm fans and boasts an intake size of 2550 square millimeters (4 square inches). 80mm fans are what most people associate as computer case fans, however there are many many choices of fans to be had from Mouser or DigiKey that are able to obtain high static pressures and CFM airflow - these are not your wimpy computer case fans, see photo below comparing the MicroDamper fans to a MacroDamper fan. It should be noted that this design has not been tested (as I don't own a large pit, yet). Because the MacroDamper is large, I incorporated an opening for a RJ45 adapter that you can pick up at Lowe's/Home Depot. I have made two version, one accepts the SG90 servo, and the other accepts the MG90 servo.

Please contact me at MicroDamper@gmail.com if you have a pit that you'd like to use this on. I'd be more than willing to assist you with fitting a fan to your pit.

Here are the files - MacroDamper

And now some photos:



 
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WBegg

TVWBB Pro
Awesome design, Steve. Keep us posted on how well it does. What's the largest CFM available for an 80mm fan?
 

SteveCK

TVWBB Pro
Thanks Will. The fans with an appreciable static pressure output top out around 75-85 CFM. They also only cost around $20-$25.
 

SteveCK

TVWBB Pro
I added a SG90 servo model to thingiverse and a 80mm to 40mm fan reducer for those who wish to run the MacroDamper with a 40mm fan.
 
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Brian Hilgert

TVWBB Member
Just upgraded to a Humphrey's Down East Beast, and while I have been using a Heatermeter for years, I've always been a fan only guy. As the DEB is much better insulated than my UDS, I feel it would perform better with a servo controlled intake damper + fan. Humphrey's come standard with a 2" nipple (and ball valve), and I currently have a 25cfm Delta Blower attached via a 2"-to-1.5" reducer. I had a hard time getting up to 350 with all vents open 100%, though this may be due in part to the fact the coals were getting low, and I was using briquettes vs lump.
After reviewing the various Servo Damper threads, I think the best fit would be the Macro Damper. Looking at the pics here and on Thingyverse, I am unable to determine what kind of connection it has on the grill/smoker sife of the unit. What is the standard connection on the Macro Damper?
 

Jay H

TVWBB Member
I've got a UDS with 2" black pipe intake. You wouldn't happen to have a version of the MacroDamper with 2" female NPT on it? I'm trying to find something on Thingiverse I can grab the threads from, but no luck yet.
 

WillD

New member
Hey. I built one. It's going on an Old Country BBQ Pecos. Will post updates after the first use.
IMG_20200509_184622.jpg
 

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