The study found that an electric backup was cheaper, at $300 to $1,500, compared to a gas furnace, estimated at around $4,000. The federal study also found that an electric backup would be cheaper if a homeowner disconnected from gas altogether, as they would save money ...
The device for switching bulk material from an inlet (2) to one of two or more outlets (3, 4) comprises a rotating valve (6). Seals (9) are fitted between the valve and its seating (1). These have a notch (10) and can be connected to a separate compressed gas inlet (12).收藏...