Which scope questions separate the two?
Use the project brief and selected equipment data. The same word can cover different construction and performance requirements between suppliers.
| Topic | Canopy question | Engineered enclosure question |
|---|---|---|
| Access | What standard doors are included? | What maintenance and removal path is required? |
| Air | What standard openings are supplied? | How is rated cooling maintained? |
| Noise | Is a rating supplied? | What target and test basis apply? |
| Structure | What support is assumed? | Who approves site loads and lifting? |
What does the generator manufacturer control?
Cummins and Caterpillar both publish application guidance about cooling air and enclosure effects. Use the selected manufacturer's current equipment data rather than transferring values from another package.
Sources: Cummins: Application Manual: Liquid Cooled Generator Sets, ventilation chapter, Caterpillar: Ambient Capability of Enclosed Generator Sets
Common questions
What else should the bid team know?
Does a canopy always meet an acoustic target?
No. The target, operating condition and test method must be specified and verified.
Can a canopy be expanded later?
Possibly, but air paths, service access and structure need project review.
Who approves enclosure loads?
The responsible structural and project engineers approve the relevant loads and design.
Primary sources
- Application Manual: Liquid Cooled Generator Sets, ventilation chapterCummins
- Ambient Capability of Enclosed Generator SetsCaterpillar
- ISO 8528-10:2022, Measurement of airborne noiseInternational Organization for Standardization
- ISO 3744:2025, Determination of sound power levelsInternational Organization for Standardization