HVAC Field Tool · Product Concept
Duct Sizer
A pocketable frame gauge that springs open to capture any rectangular duct opening up to 48″ × 48″, reads it digitally, then collapses back into your tool pouch.
UP TO 48″/SIDEDIGITAL LCDFITS THE BOX
01 /
Open it up
DUCT SIZER · OPENING● MEASURING
WIDTH
24in
×
HEIGHT
14in
DIAGONAL · SQUARE CHK27 13/16 in
Width arm24″
Height arm14″
Common duct sizes
FRONT VIEW · ON THE OPENING
24 in
14 in
24×14
CORNERS 1 & 3
Retractable tapes
Spring-loaded steel tapes pay out to close the frame and feed the encoders.
CORNERS 2 & 4
Rigid lock arms
Telescoping square tubes ratchet out and cam-lock to hold the frame square.
BODY
Digital LCD readout
Reads W × H to 1/16″ with a diagonal squareness check.
LEVERS
One-hand release
Squeeze both amber levers and the arms retract back into the body.
02 /
How it works
24×14
1
3
2
4
1
Hook the tape corners
Set the two tape-reel corners into opposite corners of the duct opening.
2
Ratchet the rigid arms out
Push the telescoping arms until the frame seats flush, then they cam-lock.
3
Read the LCD
Encoders in every corner report W × H instantly, accurate to 1/16″.
4
Squeeze & collapse
Both amber levers release the arms; everything springs back into the body.
03 /
Folds to fit
STATES · TO SCALE
0×0
~7 × 4 × 2″
→
EXPANDED
up to 48 × 48″
MEASURING RANGE6″ – 48″ per side
RESOLUTION1/16″ (0.1″ digital)
READOUTBacklit LCD · W × H × diag
STOWED SIZE~7 × 4 × 2″
WEIGHT~1.9 lb (0.86 kg)
HOUSINGGlass-filled nylon + TPR
POWER2× AAA · auto-off
DUCT SIZER · CONCEPT PROTOTYPE · NOT TO MANUFACTURING SPECREV A