Measuring Instructions: Wooden Venetian Blinds For Edwardian (Square) Conservatories

Wooden Venetian Blinds For Edwardian (Square) Conservatories Headrail & Valance Dimensions

Step 1: Choose the slat size

When measuring for angled bay windows you need to allow for the head-rail and valance depth and window handles which affect the size of the blind when fitted.

There are 3 different slats sizes which will affect the sizes of the brackets and head-rail, 25mm/35mm/50mm.

Once you have chosen the slat size you can use the illustration above to determine the allowance which will be referred to as X for the next step.

Headrail Allowance:

Option 1: The most common method of installation

1) Measure the full width of the front window. Order as RECESS SIZE

2) Measure the full width of each side window separately as they are often different and note the sizes down then deduct X from that size.

e.g. 50mm slat size : 55mm Handle allowance
Side window 870mm wide
Total allowance: Z = X (74mm) + (Y) 55mm = 129mm

870mm - 129mm = 741mm wide

3) Order the two side blinds as EXACT SIZE.

Option 2: The most tricky method of installation

On both corners measure from the corner of the bay to the start of the glass, if either measurement is less than the depth of the head-rail then we recommend to not use this option and use option 1 or option 3.

1) Measure the full width of the front window and deduct TWICE the bracket & handle allowance Z.

e.g. 50mm slat size : 55mm Handle allowance
Front window 2000mm
Total allowance: Z * 2 = X (74mm) + X (74mm) + Y (55mm) + Y (55mm) n= 258mm

2000mm - 258mm = 1742mm wide

2) Measure the full width of each side window separately as they are often different and note the sizes down then deduct X from that size.

e.g. 50mm slat size : 55mm Handle allowance
Side window 870mm wide
Total allowance: Z = X (74mm) + (Y) 55mm = 129mm

870mm - 129mm = 741mm wide

3) Order the all 3 side blinds as EXACT SIZE.

Option 3: Good if you have very small side windows

1) Measure the full width of the front window and deduct TWICE the bracket & handle allowance Z.

e.g. 50mm slat size : 55mm Handle allowance
Front window 2000mm
Total allowance: Z * 2 = X (74mm) + X (74mm) + Y (55mm) + Y (55mm) n= 258mm

2000mm - 258mm = 1742mm wide

2) Measure the full width of each side window separately as they are often different and note the sizes down, no deductions are made.

3) Order ALL THREE blinds as RECESS SIZE.

DROP

1) Measure the full drop of the window from where the brackets are mounted to the window sill.