Armstrong Series S & H: Delivering Reliable Flow for Decades. Trusted by HVAC professionals for years, the versatile Armstrong Series S & H in-line circulators offer efficient and dependable fluid circulation for hydronics heating and cooling, domestic water systems, multi-stage zoning and general industrial service. Available in a wide range of sizes, they guarantee a perfect match for any project's needs and performance requirements. The Armstrong S&H circulators now include an ECM motor option and deploy a proven fixed-speed design, which are both cost-effective, durable and easy to maintain. Models are available in the traditional sleeve-bearing design as well as the new, permanently-lubricated, maintenance-free design.
For over six decades, Snowdon has been a trusted name in the HVAC industry. Our commitment to quality is reflected in our Snowdon Approved partners, who meet the highest standards of performance and reliability.
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