There are several explanations as to why warehouse clubs charge membership fees and. how the fees play a role in the competitive landscape of the retail grocery market. We provide. another insight into the nature of the membership fee using a model of price competition. between a warehouse club and a supermarket.
A prescriptive ignition barrier is required within a residential application over the surface of the polyurethane foam insulation when used within accessible attics or crawlspaces. Interior surfaces in inhabited buildings should be covered with a 15 minute thermal barrier for fire protection.
The typical spark plug needs anywhere from 5,000 to 25,000 volts from the ignition coil before it will fire. 1  Plug gap-the wider the gap, the higher the voltage required. The gap must be set to specs for good ignition performance.  Electrode condition-wear increase voltage requirements.