sales@sidcomemphis.com

SIDCO SPIRAL DUCT INC

Custom Spiral Duct & HVAC Fittings — Manufactured to Your Specs in Memphis, TN.

Explore All Product
SIDCO Spiral Duct Inc | Hero Section
Memphis, Tennessee · Nationwide Shipping

SIDCO
Spiral Duct
Built to
Your Spec.

Custom galvanized spiral duct, HVAC fittings, and roof curb adapters — manufactured in our Memphis facility to your exact dimensions. Any diameter. Any gauge. Any length. Ships anywhere in the US.

Get a Free Quote → View All Products
48"
Max diameter
22ga
Galvanized steel
50+
Product types
USA
Nationwide shipping
🏭
In-House Manufacturing
Every piece made in our Memphis facility — no outsourcing, no delays.
Memphis, TN
📐
Custom to Your Specs
Any diameter, any length. We build to your drawings.
Custom
🚚
Shipped Nationwide
LTL freight available. We've shipped 48" duct to Pennsylvania.
All 50 States
⚡
CNC Plasma Cutting
Send your design — we cut, bend, and weld it for you.
Custom FAB
SIDCO — Capabilities Section
Galvanized Spiral Duct◆ HVAC Elbows & Fittings◆ Roof Curb Adapters◆ CNC Plasma Cutting◆ Volume Dampers◆ Round Diffusers◆ Double Wall Duct◆ Corrugated Spiral◆ Nationwide Shipping◆ Galvanized Spiral Duct◆ HVAC Elbows & Fittings◆ Roof Curb Adapters◆ CNC Plasma Cutting◆ Volume Dampers◆ Round Diffusers◆ Double Wall Duct◆ Corrugated Spiral◆ Nationwide Shipping◆
01
Spiral Duct Fabrication
Galvanized, paint-grip, double wall, and corrugated spiral duct — in-house, to any diameter you specify.
02
Fittings & Accessories
Complete range of elbows, reducers, dampers, saddle taps, couplings — all manufactured to match your duct system.
03
Roof Curb Engineering
RTU curbs, curb adapters, and ERF curbs — custom-designed for any brand or model of rooftop HVAC unit.
04
CNC Plasma & Custom FAB
Send your design file. We plasma-cut, bend, and weld it. Ideal for brackets, transitions, and custom metalwork.
Product Range

Our Duct Types

Precision-engineered spiral duct solutions for every commercial and industrial HVAC application.

01 Paint Grip Spiral Duct
Paint Grip
Spiral Duct

Hot-dipped paint grip steel for superior coating adhesion and custom finishing.

Paint-ReadyHot-Dipped
02 Galvanized Spiral Duct
Galvanized
Spiral Duct

Standard galvanized steel with excellent corrosion resistance for lasting performance.

Corrosion-ProofStandard
03 Double Wall Insulated Duct
Double Wall
Insulated Duct

Double-wall with internal insulation for superior thermal control and condensation prevention.

InsulatedThermal
04 Corrugated Spiral Duct
Corrugated
Spiral Duct

Flexible corrugated duct for vibration absorption and easy routing in complex systems.

FlexibleVibration-Safe

Need help choosing? Our team is ready to assist.

Get a Free Quote →
Testimonials

What Our Clients Say

Real feedback from HVAC professionals who trust SIDCO for their spiral duct needs.

5.0
Based on 4 reviews
"

We used SIDCO for three projects. Easy to work with, prices are really reasonable. We put an order in one morning and received the Spiral Duct the next day as planned. We sent blueprints and they took it from there.

J
Joe Houck
Memphis Heat and Air
"

SIDCO is hands down the best find for anyone in the HVAC world. The ducts fit perfectly and are super well-made. What really makes them stand out is how much they care about their customers. SIDCO is my go-to for HVAC gear.

S
Samah Ayesh
HVAC Installer
"

Sid is easy to work with and listens to his customer's needs. Dedicated to providing quality products and premium services. With over 15 years of experience in HVAC, he knows what he's talking about. Highly recommended!

D
Diyala Abdlrasul
Verified Client
"

I've shopped around and SIDCO's pricing is hard to beat. Their products don't compromise on quality. The spiral ducts were sturdy and well-made, and the roof curb adapters were a perfect fit. Best bang for your buck!

J
Jae Kahok
Verified Client
Work With Us Today →
Double Deflection Grill — Limited Offer
Limited Offer
Double Deflection Grill

High-quality double deflection grilles for commercial HVAC air distribution. Built from galvanized steel for long service life. Available in two sizes — order while stock lasts.

View All Sizes →
In Stock
Double Deflection Grill 8x40
Double Deflection Grill
8" × 40"
Galvanized Steel · Double Deflection · Commercial Grade
$119/ piece
Order Now → WhatsApp
In Stock
Double Deflection Grill 8x32
Double Deflection Grill
8" × 32"
Galvanized Steel · Double Deflection · Commercial Grade
$96/ piece
Order Now → WhatsApp

ORDER CUSTOM SPIRAL DUCT & FITTINGS ANYTIME

Looking for a specific size or fitting? At Sidco Spiral Duct, we manufacture spiral ducts in any length or diameter—tailored to your needs. Whether you need paint grip duct, double wall duct, or custom fittings like elbows, reducers, or end caps, we’ve got you covered. Simply tell us what you need—we’ll handle the rest!

Get a Free Quote
SIDCO — Inside Our Facility
1 / 16

QUANTITY TAKEOFF SERVICE AVAILABLE

SHIPPING SERVICE AVAILABLE

We recently shipped 48-inch diameter spiral ducts to our valued customer Walco Fabricating Company in Pottsville, PA.

SIDCO — Helpful Resources
Helpful Resources

Everything You Need to Know

Quick guides and answers to the most common questions from HVAC contractors, engineers, and buyers — straight from our team in Memphis.

Sizing Guide
How to Size Spiral Duct for Your HVAC System
Not sure what diameter or gauge you need? This guide walks you through the key factors — CFM requirements, air velocity, friction rate, and pressure class — so you order the right duct the first time and avoid costly mistakes on site.
5 min read  ·  For HVAC Contractors & Engineers
Material Guide
Galvanized vs Paint-Grip Spiral Duct — Which Do You Need?
Both are strong, durable options — but they serve different applications. Learn the difference between G60 galvanized and paint-grip steel, when each is the right choice, and how to specify correctly for your project.
4 min read  ·  For Specifiers & Procurement
Product Guide
What is a Roof Curb Adapter and When Do You Need One?
Replacing an RTU on an existing rooftop? A curb adapter is what makes it possible without rebuilding the curb from scratch. We explain how they work, what we need from you to fabricate one, and how to place your order.
4 min read  ·  For Facilities Managers & Mechanical Contractors
Comparison
Spiral Duct vs Rectangular Duct — Pros, Cons & Cost
Spiral duct offers better airflow efficiency, less leakage, and lower installation labor. Rectangular duct wins where space is tight. We break down both options honestly so you can make the right call for your specific project.
6 min read  ·  For Contractors & Designers
Technical Guide
HVAC Duct Gauge Guide — 18ga, 22ga, 24ga, 26ga Explained
Confused about which gauge to specify? This guide covers SMACNA pressure class requirements, when to go heavier gauge, what each gauge is best suited for, and exactly what SIDCO stocks and fabricates in-house.
5 min read  ·  For HVAC Professionals
How to Order
How to Order Custom Spiral Duct from SIDCO — Step by Step
First time ordering from us? Here's exactly how it works — from sending your specs or drawings, to getting a quote, confirming your order, and receiving your duct. We make it simple, even for large or unusual custom sizes.
3 min read  ·  For New & Returning Customers

TOP OF THE LINE MACHINES TAILORED TO YOUR NEEDS!

WHEN IT COMES TO RELIABILITY , WE ARE THE ONE YOU NEED!

Know More
Free Estimate

Request a Quote Today!

Tell us about your HVAC project and we'll get back to you with a competitive quote within 24 hours.

100% Free Quote
Commercial Grade
Reply Within 24hrs
Fast Delivery

Disclaimer:Images on the website may differ from the actual product.