Duct Insulation 1-1/2in x 48in x 25ft by Johns Manville Fiberglass

Description

Product Overview

Johns Manville Duct Insulation is engineered to meet the demanding requirements of modern heating, ventilation, and air‑conditioning (HVAC) systems. Constructed from high‑density fiberglass, this insulation delivers superior thermal resistance, reducing heat loss and gain across ductwork while also providing acoustic dampening to minimize noise transmission. The product measures 1‑1/2 inches in thickness, 48 inches in width, and 25 feet in length, a configuration that aligns with standard duct dimensions used in commercial, industrial, and large‑scale residential projects. Certified to ASTM C‑411, ASTM C‑1104, ASTM C‑665, ASTM C‑1338, ASTM E‑84, UL‑723, NFPA 90A, CAN/ULC S102‑1188, ASTM C‑1290, ASTM C‑553, and ASTM C‑1136 standards, it ensures compliance with fire‑safety, thermal‑performance, and durability criteria required by building codes worldwide. The lightweight nature—approximately 0.01 ounces per unit—facilitates easy handling and installation, while the robust material composition resists moisture absorption, mold growth, and degradation over time. With a best‑seller rank of #10 in Fiberglass Raw Materials, this product has earned a reputation for reliability among contractors, engineers, and facility managers. Its UL‑723 rating confirms a Class A fire‑resistance rating, providing peace of mind in environments where fire safety is paramount. The insulation’s low thermal conductivity (approximately 0.038 W/m·K) translates into measurable energy savings, contributing to lower utility costs and supporting sustainability goals such as LEED certification. Whether retrofitting an existing system or installing a new network, the consistent dimensions and high‑quality construction of Johns Manville Duct Insulation simplify the planning and execution phases, reducing labor time and material waste.

Usage

This duct insulation is ideally suited for a wide range of applications, from large commercial office buildings and shopping centers to industrial plants, hospitals, schools, and high‑rise residential complexes. In commercial settings, the insulation helps maintain indoor temperature stability, ensuring occupant comfort while reducing the load on HVAC equipment. In industrial environments, where process air may be heated or cooled to precise temperatures, the insulation prevents thermal losses that could affect product quality or operational efficiency. The product’s flexibility allows it to be used on both straight duct runs and curved sections, and it can be easily cut with standard utility knives to fit around fittings, elbows, and transitions. Installation crews appreciate the material’s pliability, which enables a snug fit around irregular surfaces without compromising the integrity of the insulation layer. For retrofit projects, the lightweight nature of the fiberglass board minimizes the need for additional structural support, making it a cost‑effective solution for upgrading older systems to meet current energy‑efficiency standards. The insulation also serves as a fire‑stop barrier, an essential feature in facilities that must adhere to strict fire‑code regulations, such as hospitals and data centers. When paired with appropriate duct sealing tapes and adhesives, the insulation creates a continuous thermal envelope that eliminates drafts and improves overall system performance. Its resistance to moisture and mold makes it a reliable choice for humid climates or areas with high condensation risk, ensuring long‑term durability and maintaining indoor air quality. By selecting Johns Manville Duct Insulation, engineers can design HVAC networks that achieve optimal thermal performance, comply with safety standards, and support sustainability initiatives across diverse building types.

Why Choose Us

Choosing Johns Manville as your insulation supplier means partnering with a brand that has over a century of experience in thermal and acoustic solutions. Our commitment to quality is reflected in rigorous testing protocols that verify each batch against the full suite of ASTM, UL, and NFPA standards, guaranteeing that the product you receive performs exactly as advertised. We source our fiberglass fibers from responsibly managed facilities, ensuring consistent fiber density and uniformity that translate into reliable thermal resistance and fire‑rating performance. In addition to product excellence, we provide comprehensive technical support, including installation guidelines, performance calculators, and on‑call engineering assistance to help you resolve any challenges that arise during project execution. Our logistics network offers fast, reliable shipping across North America, with options for bulk orders, drop‑ship directly to job sites, and inventory management services for contractors who need a steady supply of insulation material. We also stand behind our products with a robust warranty that covers material defects and performance shortfalls, reinforcing our confidence in the durability and effectiveness of our insulation. Sustainability is a core value at Johns Manville; our fiberglass is manufactured using recycled content where possible, and the product’s energy‑saving benefits contribute to reduced carbon footprints for the buildings it serves. By selecting our Duct Insulation, you gain access to a proven solution that combines superior thermal performance, fire safety, ease of installation, and a support ecosystem designed to help you complete projects on time and within budget.

Key Features

• High‑density fiberglass provides excellent thermal resistance, reducing heating and cooling costs.
• UL‑723 Class A fire rating ensures safety compliance for critical building applications.
• Lightweight and easy to cut, allowing quick installation and a perfect fit around ducts and fittings.
• Moisture‑resistant composition prevents mold growth and maintains performance in humid environments.
• Dedicated technical support and warranty give confidence and assistance throughout the project lifecycle.

FAQ

What is the recommended method for installing this duct insulation?

We recommend cleaning the duct surface, cutting the insulation to size with a utility knife, and securing it with approved duct tape or mechanical fasteners. Overlap seams by at least 2 inches and seal all joints to maintain a continuous thermal barrier.

Does this insulation meet fire‑safety codes for commercial buildings?

Yes, the product is UL‑723 Class A rated and complies with NFPA 90A, making it suitable for commercial, industrial, and institutional applications that require stringent fire‑resistance standards.

Can the insulation be used in humid or wet environments?

The fiberglass formulation is moisture‑resistant and does not support mold growth, so it performs well in humid climates and areas with occasional condensation, provided proper installation practices are followed.

Is this product compatible with all duct materials?

It is compatible with metal, flexible, and PVC ductwork. The flexible nature of the fiberglass board allows it to conform to various shapes, and the recommended fastening methods ensure a secure fit regardless of the duct material.

What warranty does Johns Manville provide for this insulation?

Johns Manville offers a limited warranty covering material defects and performance issues for a period of 10 years from the date of purchase, subject to proper installation according to our guidelines.