56 Cooper Lake — HVAC Subcontractor Review Package (BIM R67)
56 Cooper Lake Road — Three-Story Luxury Residence · Mableton, GA 30126
56 Cooper Lake — 3D HVAC Coordination Model (78 IFC4 Objects)
AH-M-1 · 5-Ton Main Level Air Handler (Relocated R67)
5.0 Ton · 2000 CFM · Vertical Upflow to Main Trunk · Verify closet door & service clearance
Verify IFC4 Geometry Against Contractor Source Sketches (IMG_4512 – IMG_4516)
Documents/IMG_4516.jpeg
Owner-directed R67 relocation of AH-M-1 (5 tons) to the basement storage closet immediately left of the lower utility room, plus 2.5-ton AH-B-1 and vertical supply riser RTE-M-TRUNK-01.
- 1. AH-M-1 (5-Ton Air Handler) Relocated: Moved by owner direction to the basement storage closet immediately left of the lower utility room.
- 2. Four Exhaust Locations Added: Previously omitted exhausts added for the main-floor powder room and three upstairs bathrooms.
- 3. Casita Distribution Confirmed: Three supply outlets and one return in the private Casita are owner-confirmed.
78 Geometric HVAC Products & Zone Distribution
Breakdown by HVAC System Component (78 Total)
Verified Browser Views & Spatial Containment by Zone
Contractor Source Sketches vs. Preliminary Route Studies
Solid cyan routes in the model are traced from the contractor sketches below. Dashed routes and open-square endpoints are preliminary studies, not confirmed installation paths or outlets.
| Original Sketch | Derived Review Image | Zone & Tonnage Coverage |
|---|---|---|
| Documents/IMG_4512.jpeg | Documents/Review_4512.jpg | Upper west, 1.5-ton system distribution |
| Documents/IMG_4513.jpeg | Documents/Review_4513.jpg | Upper east / Casita, 2-ton system distribution |
| Documents/IMG_4514.jpeg | Documents/Review_4514.jpg | Basement / terrace distribution layout |
| Documents/IMG_4515.jpeg | Documents/Review_4515.jpg | Main-floor supply, return & exhaust locations |
| Documents/IMG_4516.jpeg | Documents/Review_4516.jpg | Proposed basement equipment locations (AH-M-1) |
Project Scope & Technical Details
Issue Date: October 24, 2026 · Basis: BIM Revision R67 · Schema: IFC4 (78 HVAC-only geometric products; all source GUIDs and property sets preserved). CHANGES NEEDING PARTICULAR ATTENTION: • AH-M-1 (5 tons): Moved by owner direction to the basement storage closet immediately left of the lower utility room. • Exhaust Additions (4 locations): Four previously omitted exhaust locations were added—Main-floor powder room and three upstairs bathrooms. • Casita Confirmation: Three supplies and one return in the Casita are owner-confirmed. MODEL & ZONE BREAKDOWN (78 Total Objects): • By System Type: 35 Supply · 10 Return · 4 Equipment · 11 Exhaust · 18 Route • By Building Zone: Main Floor (44) · Upstairs East (13) · Basement (11) · Upstairs West (10) · Casita (8) SOURCE DOCUMENTS TO VERIFY AGAINST CONTRACTOR SKETCHES: • Documents/IMG_4512.jpeg — Upper west, 1.5-ton • Documents/IMG_4513.jpeg — Upper east / Casita, 2-ton • Documents/IMG_4514.jpeg — Basement distribution • Documents/IMG_4515.jpeg — Main-floor locations • Documents/IMG_4516.jpeg — Proposed basement equipment locations DRAWING EVIDENCE VS. PRELIMINARY STUDIES: Solid cyan routes are traced from the contractor's sketches. Dashed routes and open-square endpoints are preliminary studies, not confirmed installation paths or outlets. Equipment dimensions, mounting heights, airflow, duct sizing, transitions, and clearances require field and subcontractor verification. Optional gray floor outlines in the viewer are context only; the IFC4 model contains only HVAC geometry. This review package is for coordination review and does not establish construction approval.
Mandatory BIM & Field Coordination Checklist
- Verify AH-M-1 (5-ton air handler) relocation to the basement storage closet immediately left of the lower utility room, including clearances, return plenum, and condensate routing.
- Confirm duct routing, fan sizing, and exterior termination paths for the 4 newly added exhaust locations (main-level powder room + 3 upstairs bathrooms).
- Verify the owner-confirmed Casita HVAC layout (3 supply outlets and 1 return) and 2-ton Upper East / Casita zoning coverage (IMG_4513).
- Cross-check all 5 contractor source sketches (IMG_4512 through IMG_4516) against the 78 IFC4 objects; distinguish solid cyan sketch-traced routes from dashed preliminary route studies.
- Verify equipment dimensions, mounting heights, CFM airflow, duct sizing, transitions, and structural clearances across Main (44), Basement (11), Upstairs West (10), Upstairs East (13), and Casita (8) zones.
- Return findings by exporting review JSON from HVAC_Viewer.html, completing Contractor_Review_Form.csv, or uploading marked-up plans / revised IFC referencing item ID and GUID in the response form.