Downspout Nozzles - Figure Numbers 1770, 1771, 1775 & 1775-H5

by JRSBlogWriterNovember 7, 2012
Smith has offered downspout nozzles for many years. There are several types from which to select. The original nozzle was designed  to  accomplish two objectives. One was to provide an aesthetic termination to the rainleader downspout piping and the other was to provide a flow channel (tongue) to divert the rainwater a sufficient distance from the wall to prevent it from splashing down the face of the wall and staining the finish. The profile from the wall face to the tip of the tongue was held as tight as possible for applications where it terminates above a sidewalk in order to be less obtrusive.

Figure Number 1770 is regularly furnished in cast bronze and available in nickel bronze and polished bronze. A bird screen insert (-BS) is an option to prevent nest building and the entry of vermin. The 1770 nozzle is available in a threaded (2”-12”) and no-hub (2”-6”) connection. A wall flange is provided to cover the rough opening and is secured to the wall.

Figure number 1771 is regularly furnished in cast bronze and available in nickel bronze and polished bronze. A bird screen insert (-BS) is an option to prevent nest building and the entry of vermin. The rainleader downspout piping extends beyond the face of the wall and flange allowing the nozzle to slide over the piping and is secured with set screws. It is available in 2”  – 12” connections. A wall flange is provided to cover the rough opening.

Several  years  ago  Smith  introduced  a  special purpose stainless steel rainleader downspout cover that features a hinged stainless steel perforated cover. The cover remains closed during no flow preventing entry of unwanted vermin. During minimal flows, the cover allows discharge through the perforations. It is available in 1½” – 15” sizes can be optionally provided in polished bronze and chrome plated brass. Please refer to figure number 1775. This unit projects a minimal dimension from the face of the wall of 2½”.

The 1775-H5 is the same as described for the 1775 except it projects 5” from the face of the wall. This dimension can be increased upon request with the Sales Engineering group.

Please refer to the four submittal drawings located in the original newsletter.

DOWNSPOUT NOZZLE LOCATION:

The architect or engineer determines the location of the downspout nozzle. We are asked for a height recommendation frequently and our recommendation is 12” to 24” from the bottom of the nozzle to the finished area whether it is a sidewalk or a grassy/soil area. If it is installed too high, the rainwater may splash against the wall. This dimension should be added to the spec or detail. We have seen two installations where the contractor installed the nozzle on the exterior of the parapet wall several stories high. While this created a nice waterfall and conversation, there were other problems created. Attached is a typical downspout nozzle detail from an architect’s drawing. It is referred to as a lamb’s tongue detail.

You will notice the roughing height dimension was not shown on the detail. Most likely, without a specific dimension, the nozzle will be installed at 24’ which seems to the default dimension for nozzles. Also, this architect required sealant behind the flange. This really is not necessary and is not Smith’s responsibility.

Download the original newsletter here: Vol. 2, Issue 4: Downspout Nozzles, Figure Numbers 1770, 1771, 1775 & 1775-H5 Product Alert