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comparisons with shell and tube . shell and tube units can be designed for very high pressures whereas phes are limited to approximately bar design pressures exceeding bar are rarely called for in refrigerant applications. . shell and tube units can be designed for lower temperatures. phes contain elastomeric...
and other nuisance wildlife contraptions and deterrents are available at garden stores, or on-line by searching on "nuisance wildlife products." discouraging gulls from nesting on rooftops one deterrent that seems to work on flat roofs is to put up a series of parallel lines of wire cables or monofilament...
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