This Technical Note is to notify you that Tecvalco has changed the brand of glycol in the CWT Heater. This change took affect in April 2016.

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1 UTILITY, MUNICIPAL, AND WHOLESALE SUPPLY May 5, 2016 Technical Note: CWT Dear Customer, This Technical Note is to notify you that Tecvalco has changed the brand of glycol in the CWT Heater. This change took affect in April Prior to that date, the glycol used in the CWT Heater was DowFrost HD. The new glycol being used is ClearFrost HD. This glycol exhibits a slightly higher boiling point, while still providing the same freeze protection as the previous glycol. Further, ClearFrost HD is 100 per cent compatible - and mixable - with DowFrost glycol as both are heavy inhibited propylene glycols. Please find attached the full specification information sheets for both the old and the new glycol. The DowFrost HD is still available for customers that have a concern, but there will be an extra cost. Should you have any questions, please contact us. Eastern Canada Western Canada Tecvalco USA 3481 Stanley Ave. P.O. Box S. Hopkins Ave. Niagara Falls, ON North Battleford, SK Titusville, Florida L2E 6S4 S9A 3M

2 ClearFrost HD Fully-Formulated Propylene Glycol-Based Heat Transfer Fluid Product Features Inhibitor system is phosphate-based Functional equivalent to Dowfrost HD*, and can be mixed with this product with no adverse effects. Operating range of -60ºF to +325ºF Unique additive package: o Controls corrosion of metals o Helps prevent scaling and fouling of heat transfer surfaces o Buffers the ph to maintain it in the optimum operating range Overview ClearFrost HD is a fully-formulated heat transfer fluid containing an inhibitor and additive package that controls corrosion of metals, helps prevent scaling and fouling of heat transfer surfaces, and buffers the ph to maintain it in the optimum operating range. ClearFrost HD meets or exceeds ASTM D 1384, which is the industry-accepted multimetal corrosion test. The inhibitor system is based on a high-phosphate, multicomponent formulation which makes ClearFrost HD equivalent in terms of functionality and performance to the very best national brands on the market, including Dowfrost HD*. Raw ClearFrost HD contains 94.0% mono-propylene glycol and 6.0% inhibitors, including performance-enhancing additives and deionized water. Applications Process cooling/heating HVAC system freeze/burst/corrosion protection Solar heating Refrigeration warehouse floor heating Thermal energy storage Ice skating rinks Sidewalk snow melting systems Cold room dehumidify Operating Temperature Range and Freeze/Burst Protection ClearFrost HD has a recommended operating temperature range of -60ºF to +325ºF, and can be used to provide both freeze and burst protection for systems which may be exposed to very low temperatures. To obtain adequate freeze protection, select a glycol concentration with a freeze point at least 5 F below the lowest anticipated ambient temperature. (The concentration should be at least 30% propylene glycol to maintain adequate corrosion inhibitors). If the concentration is below 30% the same amount of additive must be added to equal the amount found at a 30% concentration. Corrosion Protection Contact Information Clear Glycol & Solvent Street Stettler, Alberta T0C 2L (Monday - Friday 8:00 am - 4:30 pm) ClearFrost HD provides outstanding corrosion protection for copper, brass, solder, steel, and cast iron and aluminum. It meets or exceeds ASTM D 1384, the standard industry corrosion test for these metals. It is also completely compatible with most plastics, elastomers and types of rubber. It s corrosion protection system protects iron, steel and aluminum metal surfaces to protect them from acidic attack and rust formation. ClearFrost HD also contains tolytriazoles to protect copper, brass and solder from attack, as well as oxygen scavengers to provide further protection from rust and pitting. A very effective buffering system neutralizes acids formed by the normal thermal and oxidative degradation of glycols, thus maintaining the ph in its optimum range. Water Quality Requirements Demineralized or deionized water is required when diluting ClearFrost HD. In Case of Emergency, call (24 hours/day, 7 days/week) *Dowfrost and Dowfrost HD are trademarks of the Dow Chemical Co.

3 ClearFrost HD Typical Properties Temp (ºF) 15% Glycol 30% Glycol 40% Glycol 50% Glycol 60% Glycol Physical Property Solution Solution Solution Solution Solution Thermal Conductivity [BTU/(hr ft3) (ºF/ft)] Specific Heat [(BTU/(lb ºF)] Viscosity, Centipoise Density, (lb/ft3) Characteristics using EG/PG Composition (Concentrate) Ethylene/Propylene glycol 94.0 weight % Inhibitors & deionized water 6.0 weight % Color Distinctive ph 50% solution % solution Ethylene Glycol ClearTherm Freezing Point F Boiling Point 760 mm Hg Specific Gravity (60 F) Ethylene Glycol 96% solution % solution Specific Gravity (60 F) Propylene Glycol 96% solution % solution Reserve Alkalinity 96% solution 10.0 ml 50% solution 5.0 ml Propylene Glycol ClearFrost Freezing Point F Boiling Point 760 mm Hg Flash Point Ethylene Glycol 96% solution 240 F 50% solution none Flash Point Propylene Glycol 96% solution 220 F 50% solution none Street Stettler, Alberta T0C 2L

4 D O W F R O S T H D HEAT TRANSFER FLUID Engineering Specifications for Closed-Loop HVAC Systems MANUFACTURER The Dow Chemical Company Thermal Fluids Business 100 Larkin Center Midland, Michigan Phone: GENERAL PRODUCT DESCRIPTION DOWFROST * HD industrially inhibited propylene glycol-based heat transfer fluid is manufactured by The Dow Chemical Company. Aqueous solutions of DOWFROST HD fluid are designed to provide freeze/burst and corrosion protection, as well as efficient heat transfer, in water-based, closed-loop heating and air-conditioning systems. DOWFROST HD fluid has an operating temperature range of -50 F to 325 F; with fluid freeze protection to below -60 F, and system burst protection to below -100 F. The fluid contains corrosion inhibitors that are specially formulated for HVAC systems to keep pipes free of corrosion without fouling. DOWFROST HD fluid can be specified for use in new HVAC systems, or as a replacement fluid for use in existing systems. The fluid is dyed bright yellow to facilitate system leak detection. DOWFROST HD fluid is also suitable for ice storage systems used either in the closed circulation loop from the chiller to the storage medium; or, in solution with water, in the medium itself. Compared to DOWFROST fluid, DOWFROST HD fluid features a higher maximum operating temperature, higher reserve alkalinity and greater thermal stability for longer fluid life. Extra-strength corrosion inhibitors in DOWFROST HD fluid are formulated for high temperature use, resulting in reduced maintenance and longer inhibitor life in most applications. DOWFROST fluid is recommended for use in applications where low acute oral toxicity is important or where incidental contact with drinking water is possible. Since the toxicity of heat transfer fluids may be adversely altered in HVAC systems, used fluids should be handled with reasonable care, and not be taken internally. HVAC SYSTEM FLUID SPECIFICATION Closed-loop, water-based systems 1. FLUID MATERIAL The propylene glycol to be used in such a system must meet the following requirements: 1.1 The fluid must be an industrially inhibited propylene glycol (phosphate-based). 1.2 The fluid must be dyed [bright yellow] to facilitate leak detection. 1.3 The fluid must be easily analyzed for glycol concentration and inhibitor level. 1.4 For systems containing more than 250 gallons of fluid, annual analysis must be provided free of charge by the fluid manufacturer. 1.5 The fluid must pass ASTM D1384 (less than 0.5 mils penetration per year for all system metals). 1.6 The reserve alkalinity of the fluid must be at least 15 to provide long-term resistance to acidic ph. 2. FLUID INSTALLATION Follow these installation procedures: 2.1 Clean new or lightly corroded existing systems with a 1% to 2% solution of trisodium phosphate in water prior to the installation of industrially inhibited propylene glycol fluid. 2.2 Extensively corroded existing systems should be cleaned by an industrial cleaning company and all necessary replacements and repairs should be made. 2.3 Use only good quality water in solution with the propylene glycol fluid. Use water with low levels (less than 25 ppm) of chloride and sulfate, and less than 50 ppm of hard water ions (Ca ++, Mg ++ ). Distilled or deionized water is recommended. If good quality water is unavailable, purchase pre-diluted solutions of industrially inhibited propylene glycol fluid from the fluid manufacturer or, if available, from the distributor. 3. SYSTEM DESIGN CONSIDERATIONS 3.1 Avoid use of automatic water make-up systems to prevent undetected dilution of the propylene glycol and possible contamination of the water system. *Trademark of The Dow Chemical Company

5 4. TECHNICAL DATA 4.1 DOWFROST HD Fluid, Product Description Composition, % by weight Glycols 94 Inhibitors and water 6 Color Bright Yellow Specific gravity at 60/60 F ph of solution containing 50% glycol Reserve alkalinity, minimum 15.0 ml 4.2 Typical Properties of Aqueous Solutions (Glycol percentage by volume) Physical Temp. 30% Glycol 40% Glycol 50% Glycol 60% Glycol Property F Solution Solution Solution Solution Thermal Conductivity Btu/(hr ft 2 )( F/ft) Specific Heat, Btu/(lb F) Viscosity, Centipoise Density, (1b/ft 3 ) Typical properties, not to be construed as specifications. 4.3 Freezing and Boiling Points of Aqueous Solutions Freezing % Glycol Boiling Temperature, F by Volume Temperature, F < For further information, call... In The United States And Canada: Fax In Europe: Fax In The Pacific: Fax In Other Global Areas: Fax NOTICE: No freedom from any patent owned by Seller or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer s use and for ensuring that Customer s workplace and disposal practices are in compliance with applicable laws and other governmental enactments. Seller assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED. Published April *Trademark of The Dow Chemical Company Form No AMS